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Journal articles on the topic 'Meteoritos'
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Pucheta, Flavia Noelia, Maria Elizabeth Zucolotto, Vitória Régia Péres da Rocha Oliveiros Marciano, César Mendonça Ferreira, Flávio Sandro Lays Cassino, and Antônio Luciano Gandini. "Estudo petrográfico e metalográfico dos meteoritos Bocaiúva e João Pinheiro aliado à técnica de MEV/EDS." Rem: Revista Escola de Minas 64, no. 2 (June 2011): 155–61. http://dx.doi.org/10.1590/s0370-44672011000200004.
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O Brasil possui 58 meteoritos catalogados pela ciência meteorítica, número bastante inferior quando se compara tal número àqueles de países da Europa e aos de países como os Estados Unidos. As amostras estudadas pertencem à coleção de meteoritos do Museu de Mineralogia Professor Djalma Guimarães -MMPDG, constituída de 17 meteoritos, 10 brasileiros, entre eles o Bocaiúva e o João Pinheiro. O meteorito Bocaiúva, encontrado em MG, é o terceiro maior em peso do Estado (64kg), foi achado por volta de 1947, na cidade homônima, a 384km de Belo Horizonte. Além da massa principal do meteorito Bocaiúva, também há, no referido museu outro fragmento catalogado como "meteorito Bocaiúva", que, na verdade, é um fragmento pertencente a outro corpo meteorítico, o João Pinheiro, ainda não catalogado. A diferença mineralógica observada em ambos, principalmente com relação às porções silicáticas do Bocaiúva, assim como inclusões fluidas e fundidas, não deixa dúvida de se tratar de meteoritos diferentes. Minerais como kamacita, taenita, troilita, schreibersita e grafita são encontrados no meteorito João Pinheiro, enquanto que, no Bocaiúva, estão presentes a forsterita, kamacita, taenita, troilita, schreibersita, pentlandita, magnetita, cromita, pigeonita, diopsídio, enstatita, plagioclásios, apatita, calcita e goethita.
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Nobre, Augusto Gonçalves, Gaston Eduardo Enrich Rojas, Ananda Lopes Proença Ribeiro Fonseca, and Odila Florêncio. "História e desenvolvimento da ciência meteorítica." Terrae Didatica 17 (November 30, 2021): e021041. http://dx.doi.org/10.20396/td.v17i00.8667026.
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Este trabalho de revisão bibliográfica descreve a origem, os desdobramentos históricos e o panorama geral da Meteorítica. A humanidade possui contato com meteoritos desde a Pré-História, quando o conhecimento era associado a tradições culturais. A partir da observação sistemática de quedas, e da coleta de amostras, foram iniciados os estudos que possibilitaram constatar sua origem espacial. Com o avanço e o refinamento das técnicas de caracterização tornou-se possível explorar progressivamente a composição e estrutura dos meteoritos, permitindo inferir os processos de formação cósmica. A Meteorítica no Brasil se iniciou no século XVIII. O país possui mais de 70 meteoritos registrados, com alguns exemplares proeminentes, como o meteorito Angra dos Reis. Apresenta-se uma síntese da obra de alguns autores nacionais, como contribuição para difundir o conhecimento geocientífico.
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Carvalho, Wilton Pinto, Débora Correia Rios, Maria Elizabeth Zucolotto, Herbet Conceição, Acácio José Silva Araújo, and Amanda Araújo Tosi. "O meteorito Palmas de Monte Alto:." Geologia USP. Série Científica 18, no. 3 (October 3, 2018): 15–31. http://dx.doi.org/10.11606/issn.2316-9095.v18-132539.
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Diversos parâmetros têm sido utilizados para a classificação dos meteoritos de ferro, principalmente sua mineralogia e suas propriedades químicas e estruturais. Este artigo resgata e documenta o achado do meteorito férreo Palmas de Monte Alto, apresentando uma sequência de parâmetros classificatórios que amplia e detalha os dados disponíveis sobre o fragmento. Esse meteorito, um siderito, foi achado no topo da serra de Monte Alto antes de 1955 e hoje representa um dos seis espécimes que compõem a coleção de meteoritos do estado da Bahia. Ele é constituído de uma única massa de 97 kg com alto estágio de oxidação externa em locais em que a crosta de fusão foi removida. Sua mineralogia inclui kamacita, taenita e plessita, bem como fases minerais secundárias, tais como o óxido de Fe-Ni akaganeíta. Também estão presentes minerais acessórios de ocorrência comum em ligas metálicas de Fe-Ni de origem espacial, isto é, schreibersita, cromita e troilita, e foi identificada uma rara solução sólida de ortofosfatos de Fe-Mn composta dos minerais heterosita-purpurita ou sarcopsida-graftonita como membros extremos. A largura média de suas lamelas de kamacita (0,95 ± 0,15 mm) permite classificar estruturalmente o meteorito como um octaedrito médio, com padrão Widmanstätten médio e bem definido. Seus teores de Ni (9,40 wt%) e Co (0,46 wt%) comparados aos elementos-traço Ga (22 ppm), Ir (0,70 ppm), As (16,00 ppm) e Au (1,70 ppm) recomendam a inclusão desse meteorito no grupo químico IIIAB.
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PEREIRA, GONZALO. "¿TIENEN EL MISMO ORIGEN LOS METEORITOS METÁLICOS ENCONTRADOS EN BOLIVIA?" Revista Boliviana de Física 38, no. 38 (November 30, 2021): 10–14. http://dx.doi.org/10.53287/eohr3986hv72b.
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While reconstructing the history of meteorites related to Bolivia, we found that the only two metallic meteorites classified as “Found in Bolivia” are the Bolivia and Pooposo meteorites. They are classified within the group of MG IAB iron meteorites and have a similar history. Both were seriously mishandled before reaching the hands of meteorite experts and were commercialized by a priest. In light of these possible matches, some experts have recommended a comparative study of both meteorites to ascertain if they could be part of the same object. In this paper we analyze the data of abundant chemical elements found in both meteorites. The data was obtained from different analyses carried out on all known iron meteorites through methods such as: Radiochemical Neutron Activation Analysis (RNAA) and Instrumental Neutron Activation Analysis (INAA). These data have been published by different researchers: Buchwald (1975a); Scott (1978); Kracher et al. (1980); Wasson & Kallemeyn (2002). Our objective has been to determine if both specimens are part of a larger object that impacted on the surface of the Oruro plateau or if they are simply two independent iron meteorites.
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Pinto, Gabriel, Laura Flores, and Rodrigo Martínez. "Museos interactivos de ciencia y la alfabetización científica." Ápice. Revista de Educación Científica 4, no. 2 (December 1, 2020): 63–72. http://dx.doi.org/10.17979/arec.2020.4.2.5829.
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Los museos de ciencia son importantes centros de educación no formal en todo el mundo. El museo del meteorito Chile, perteneciente a este grupo, está enfocado en la comunicación y divulgación de las ciencias meteoríticas por medio de su exhibición e investigación. Su ubicación en la localidad de San Pedro de Atacama se contextualiza con su tópico museográfico debido al alto porcentaje de meteoritos hallados en las superficies del Desierto de Atacama. En este artículo se analiza el Museo del Meteorito de Chile bajo su valor educacional, científico y su relación con la comunicación de la ciencia meteorítica en Chile. Para ello se examina un registro sociodemográfico y el interés de las visitas por el recorrido museístico. De manera final se realiza un balance del rol de alfabetización del Museo del Meteorito de Chile.
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Nascimento-Dias, Bruno. "Aplicação da espectroscopia Raman na identificação de olivinas em meteoritos." Journal of Experimental Techniques and Instrumentation 4, no. 2 (April 14, 2021): 21–28. http://dx.doi.org/10.30609/jeti.v4i2.12434.
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A técnica de espectroscopia Raman tem sido cada vez mais utilizada na caracterização de rochas terrestres e meteoritos em geral. No entanto, a literatura em língua portuguesa com informações sobre como se distinguir os minerais constituintes de rochas, sejam terrestres ou extraterrestres, são escassos e quase inexistentes. Dessa forma, o objetivo deste trabalho é apresentar como é possível determinar a presença de olivinas e identificar qual tipo de mineral do grupo especificamente se encontra na mostra de maneira rápida, sucinta e acessível. Vale salientar que o grupo das olivinas é caracterizado pelos seus membros finais, a faialita (Fe2SiO4) e a forsterita (Mg2SiO4). A identificação dos espectros foi realizada a partir de espectros de minerais puros alocados no banco de dados RRUFF e comparados com espectros obtidos dos meteoritos carbonáceos (Allende e Murchison) e o meteorito marciano NWA 7397. Por fim, este trabalho não possui o propósito de ter um aprofundamento detalhado de análises e as especificidades maiores do Raman, o qual poderá ser adquirido pelos leitores através de materiais complementares e com assistências de técnicos mais especializados no equipamento e na técnica de Raman.
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Mendez Escamilla, Y., G. Gallegos Ortega, and J. A. Cobos-Murcia. "Micro-diamantes originados por impacto de meteoritos." Tópicos de Investigación en Ciencias de la Tierra y Materiales 5, no. 5 (May 10, 2022): 69–76. http://dx.doi.org/10.29057/aactm.v5i5.9116.
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Los micro-diamantes formados por un meteorito o también llamados diamantes de impacto, son diamantes creados a partir del metamorfismo generado por el choque entre un cuerpo cósmico y la corteza (zona de impacto). Para que este fenómeno ocurra, deben darse ciertas condiciones termodinámicas. Hasta el momento, solo se conoce la formación de microdiamantes y se desconocen las condiciones energéticas emitidas por el choque de masas (meteorito y suelo) para asemejarse a uno de los procesos geológicos más importantes para la formación de diamantes terrestres, así como la forma en que se expresa espontáneamente dicho fenómeno. Por ello, en el presente trabajo se estudiaron simuladamente los cambios termodinámicos (entalpía, entropía y capacidad calorífica) a los que es sometido el carbono de la corteza terrestre para la formación de diamantes terrestres, pero bajo las condiciones de impacto de meteoritos. Para ello se utilizaron los softwares HSC Chemistry (versión 5.1) y wolframalpha manipulando las variables fase del carbono y temperatura, esta última de acuerdo a los valores registrados para la formación de micro-diamantes por impacto y diamantes terrestres, así mismo se estudiaron los resultados de acuerdo a la fase del carbono. Los resultados del trabajo indicaron que el fenómeno es exógeno y/o endógeno dependiendo de la fase del carbono capturado en el software y su grado de dispersión de energía. Ya que a mayor dispersión de energía la formación de diamantes no se ve favorecida.
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García Cruz, Cándido Manuel. "Miguel Rubín de Celis (1746-1799) and the meteorite of Campo del Cielo (El Chaco Austral, Argentina)." Boletín de la Real Sociedad Española de Historia Natural 2023/117 (2023): 89–105. http://dx.doi.org/10.29077/bol.2023.117.garciacruz.
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Miguel Rubín de Celis, a Spanish officer and explorer in South America, carried out, 1783, an expedition in the search for a mass of iron in Campo del Cielo, El Chaco Austral, Viceroyalty of Río de la Plata (nowadays, a part of Argentina). He sent a report concerning that expedition to the Viceroy in 1785, and later a short paper about his find was published by the Royal So¬ciety of London (1788), of which the 235th Anniversary is celebrated in 2023. This paper had an enormous importance, at the end of the 18th Century, to E.F.F. Chladni in his essay on the cosmic origin of meteorites. A short study on the search for this meteorite is made, as well as a biographical sketch of Rubín de Celis and a summary of his expedition to the Chaco, and finally the Spanish text of the cited paper is reproduced, in a revised, annotated and critical version. En 1783, el oficial y explorador español Miguel Rubín de Celis llevó a cabo una expedición en búsqueda de una masa de hierro en Campo del Cielo, El Chaco Austral, Virreinato del Río de la Plata (actualmente, parte de Argentina). Sobre esta expedición envió un informe al Virrey en 1785, y posteriormente publicó un breve artículo en relación con este hallazgo en la Royal Society of London (1788), del que se cumple el 235º Aniversario en 2023. Dicho artículo fue de gran interés, a finales del siglo XVIII, para E.F.F. Chladni en su ensayo sobre el origen cósmico de los meteoritos. Se hace un breve estudio sobre la búsqueda de este meteorito, una semblanza de la biografía de Rubín de Celis, y un resumen de su expedición al Chaco, y por último se reproduce el texto castellano íntegro del artículo citado, en versión revisada, anotada y crítica.
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Nascimento-Dias, Bruno Leonardo. "METEORITOS CONDRITOS: ROCHAS EXTRATERRESTRES PRIMITIVAS DO SISTEMA SOLAR." Revista Geociências - UNG-Ser 20, no. 1 (December 27, 2021): 36. http://dx.doi.org/10.33947/1981-741x-v20n1-4672.
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Os condritos são considerados os meteoritos mais primitivos do sistema solar e possuem essa denominação por conta dos côndrulos em sua matriz. Esses materiais possuem informações preciosas sobre o início do Sistema Solar, pois não experimentaram fusão e diferenciação ígnea. Atualmente, a comunidade científica segue a classificação que reúne os meteoritos em clãs, grupos e classes. Isto é importante, pois a partir das propriedades diferentes encontradas entre os condritos, é possível saber o ambiente no qual eles foram formados, seria como localização do afloramento e seu contexto regional para a geologia. Dessa forma, o objetivo principal aqui é desenvolver uma revisão ampla e sintetizada sobre os meteoritos condritos. Em geral, os condritos são agrupados em clãs menores e divididos em Carbonáceos (C), Ordinários (CO), Enstatita (E), Rumirutitos (R) e Kakangaritos (K). É importante mencionar que existem 3 processos que podem alterar as suas características primordiais dos condritos, que são 1) A alteraçaÌo aquosa, 2) O metamorfismo termal, 3) Impacto ou metamorfismo de choque, além do próprio intemperismo terrestre. Por fim, espera-se que este artigo possa contribuir como referencial teórico para alunos de graduação e pós-graduação, pois existem pouquíssimos artigos e literatura na língua portuguesa sobre meteorítica e este trabalho buscou fazer um apanhado geral sobre meteoritos condritos.
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NASCIMENTO-DIAS, Bruno Leonardo. "METEORITOS MARCIANOS REALMENTE VIERAM DE MARTE?" Geosciences = Geociências 40, no. 3 (October 18, 2021): 771–80. http://dx.doi.org/10.5016/geociencias.v40i03.15623.
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Os meteoritos marcianos, em sua maioria, são considerados rochas ígneas oriundas de materiais basálticos e ultramáficos de Marte. Atualmente, os meteoritos oriundos de Marte são divididos em 4 grupos (Shergottito, Nakhlito, Chassignito e Ortopiroxênito) de acordo com sua estrutura e composição química. Isto é importante, pois o agrupamento desses materiais facilita a buscar o possível ambiente do qual eles se originaram, ou em outras palavras, seria como saber a localização do “afloramento” e seu “contexto regional” para a geologia. Dessa forma, o objetivo principal aqui é desenvolver uma revisão ampla e sintetizada sobre os meteoritos SNC. Uma das justificativas é que em 2021, mais precisamente em fevereiro, chegará em Marte a perseverance, que irá explorar um paleolago profundo de 250 m cerca de 3,9 bilhões a 3,5 bilhões de anos atrás. Sendo assim, este pode ser um momento oportuno para reunir conteúdo em português e avaliar criticamente o que sabemos e o que precisamos ainda aprender sobre Marte. Outra justificativa é que embora exista uma quantidade substancial de artigos em inglês sobre meteoritos SNC muitos deles estejam desatualizados e a literatura em português sobre SNC é escassa, praticamente inexistente. Assim, espera-se que este artigo possa ser utilizado como referência para alunos de graduação e Pós-graduação, proporcionando informações relevantes para o desenvolvimento e aprendizagem da meteorítica, mais especificamente dos SNC, tal como fazer a difusão de seus conceitos para futuros trabalhos de iniciação científica, monografias, dissertações ou até mesmo teses.
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Drouard, A., P. Vernazza, S. Loehle, J. Gattacceca, J. Vaubaillon, B. Zanda, M. Birlan, et al. "Probing the use of spectroscopy to determine the meteoritic analogues of meteors." Astronomy & Astrophysics 613 (May 2018): A54. http://dx.doi.org/10.1051/0004-6361/201732225.
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Context. Determining the source regions of meteorites is one of the major goals of current research in planetary science. Whereas asteroid observations are currently unable to pinpoint the source regions of most meteorite classes, observations of meteors with camera networks and the subsequent recovery of the meteorite may help make progress on this question. The main caveat of such an approach, however, is that the recovery rate of meteorite falls is low (<20%), implying that the meteoritic analogues of at least 80% of the observed falls remain unknown. Aims. Spectroscopic observations of incoming bolides may have the potential to mitigate this problem by classifying the incoming meteoritic material. Methods. To probe the use of spectroscopy to determine the meteoritic analogues of incoming bolides, we collected emission spectra in the visible range (320–880 nm) of five meteorite types (H, L, LL, CM, and eucrite) acquired in atmospheric entry-like conditions in a plasma wind tunnel at the Institute of Space Systems (IRS) at the University of Stuttgart (Germany). A detailed spectral analysis including a systematic line identification and mass ratio determinations (Mg/Fe, Na/Fe) was subsequently performed on all spectra. Results. It appears that spectroscopy, via a simple line identification, allows us to distinguish the three main meteorite classes (chondrites, achondrites and irons) but it does not have the potential to distinguish for example an H chondrite from a CM chondrite. Conclusions. The source location within the main belt of the different meteorite classes (H, L, LL, CM, CI, etc.) should continue to be investigated via fireball observation networks. Spectroscopy of incoming bolides only marginally helps precisely classify the incoming material (iron meteorites only). To reach a statistically significant sample of recovered meteorites along with accurate orbits (>100) within a reasonable time frame (10–20 years), the optimal solution may be the spatial extension of existing fireball observation networks.
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Smith, Caroline. "Meteorites – The Significance of Collection and Curation and Future Developments." Proceedings of the International Astronomical Union 10, H16 (August 2012): 147. http://dx.doi.org/10.1017/s1743921314005055.
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AbstractMeteorites are some of the most important and valuable rocks available for scientific study. Approximately 43,000 meteorites are known on Earth and are egeologicalf samples of extraterrestrial bodies - meteorites are known to originate from asteroids, the Moon, Mars and possibly comets. With expanding exploration of our Solar System, meteorites provide the eground truthf to compare data collected by robotic missions with results gained from a variety of more accurate and precise techniques using laboratories on Earth. This talk will give an introduction to the history of meteorite science and the importance of meteorite collections to the field of meteoritics, planetary and solar system science. Curation of extraterrestrial samples is a particularly pertinent issue, especially with regards to particularly rare samples such as those from Mars like the recent Tissint meteorite. Future sample return missions to asteroids and Mars also pose siginificant challenges around the curation of these precious materials. Issues surrounding the curation of samples and how curation and curatorial actions can influence scientific studies will also be discussed.
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Plotkin, Howard, and Roy Clarke. "The Controversial History of the Goose Lake, California, Meteorite." Earth Sciences History 31, no. 2 (January 1, 2012): 229–46. http://dx.doi.org/10.17704/eshi.31.2.w1ltq51n15241003.
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The Goose Lake meteorite, a 2,573 lb (1,167 kg) iron, was found by three deer hunters on lava beds in the Modoc National Forest in northeast California in October, 1938. Although several California persons wanted possession of the meteorite for various California institutions, under the powers of the 1906 Antiquities Act meteorites found on US federal lands were typically transferred to the US National Museum at the Smithsonian Institution and accessioned into the National Collection of Meteorites. With authorization from the US Department of Agriculture, the Smithsonian began a correspondence with one of the meteorite's finders to arrange for its retrieval. But the situation became complicated and controversial when meteorite collector/dealer Harvey H. Nininger (1887-1986), who harboured hopes that the meteorite might be on a parcel of private land in the National Forest, falsely presented himself to the finder as a Smithsonian agent, and was taken to the site of the meteorite. A survey showed the meteorite was on federal land, however, and the Smithsonian reluctantly allowed Nininger to oversee its recovery. During the time that the meteorite was on loan from the Smithsonian and on exhibit at the San Francisco World's Fair, considerable pressure from various California individuals and institutions was put on the Smithsonian to keep the meteorite in California, but it was accessioned into the Smithsonian's National Collection of Meteorites and shipped to Washington, DC. The controversial history of the Goose Lake meteorite affirmed the applicability of the Antiquities Act with regard to the disposition of meteorites found on US federal lands, and set the stage for the later court rulings involving the Old Woman meteorite, a large (2,753 kg) iron found on government land in California in 1976. Problematic ownership issues like those involving the Goose Lake meteorite exist in other countries besides the United States, and in other branches of natural history, especially paleontology. The Goose Lake meteorite is famous for its numerous and enigmatic large holes and cavities, and is a popular attraction at the Smithsonian's National Museum of Natural History in Washington, DC.
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Watson, Jonathan S., Victoria K. Pearson, Mark A. Sephton, and Iain Gilmour. "Molecular, isotopic and in situ analytical approaches to the study of meteoritic organic material." International Journal of Astrobiology 3, no. 2 (April 2004): 107–16. http://dx.doi.org/10.1017/s1473550404002046.
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Organic materials isolated from carbonaceous meteorites provide us with a record of pre-biotic chemistry in the early Solar System. Molecular, isotopic and in situ studies of these materials suggest that a number of extraterrestrial environments have contributed to the inventory of organic matter in the early Solar System including interstellar space, the Solar nebula and meteorite parent bodies.There are several difficulties that have to be overcome in the study of the organic constituents of meteorites. Contamination by terrestrial biogenic organic matter is an ever-present concern and a wide variety of contaminant molecules have been isolated and identified including essential plant oils, derived from either biological sources or common cleaning products, and aliphatic hydrocarbons, most probably derived from petroleum-derived pollutants. Only 25% of the organic matter in carbonaceous chondrites is amenable to extraction with organic solvents; the remainder is present as a complex macromolecular aromatic network that has required the development of analytical approaches that can yield structural and isotopic information on this highly complex material.Stable isotopic studies have been of paramount importance in understanding the origins of meteoritic organic matter and have provided evidence for the incorporation of interstellar molecules within meteoritic material. Extending isotopic studies to the molecular level is yielding new insights into both the sources of meteoritic organic matter and the processes that have modified it.Organic matter in meteorites is intimately associated with silicate minerals and the in situ examination of the relationships between organic and inorganic components is crucial to our understanding of the role of asteroidal processes in the modification of organic matter and, in particular, the role of water as both a solvent and a reactant on meteorite parent bodies.
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Ruf, Alexander, Basem Kanawati, Norbert Hertkorn, Qing-Zhu Yin, Franco Moritz, Mourad Harir, Marianna Lucio, et al. "Previously unknown class of metalorganic compounds revealed in meteorites." Proceedings of the National Academy of Sciences 114, no. 11 (February 27, 2017): 2819–24. http://dx.doi.org/10.1073/pnas.1616019114.
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The rich diversity and complexity of organic matter found in meteorites is rapidly expanding our knowledge and understanding of extreme environments from which the early solar system emerged and evolved. Here, we report the discovery of a hitherto unknown chemical class, dihydroxymagnesium carboxylates [(OH)2MgO2CR]−, in meteoritic soluble organic matter. High collision energies, which are required for fragmentation, suggest substantial thermal stability of these Mg-metalorganics (CHOMg compounds). This was corroborated by their higher abundance in thermally processed meteorites. CHOMg compounds were found to be present in a set of 61 meteorites of diverse petrological classes. The appearance of this CHOMg chemical class extends the previously investigated, diverse set of CHNOS molecules. A connection between the evolution of organic compounds and minerals is made, as Mg released from minerals gets trapped into organic compounds. These CHOMg metalorganic compounds and their relation to thermal processing in meteorites might shed new light on our understanding of carbon speciation at a molecular level in meteorite parent bodies.
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Wampler, James, Mark Thiemens, Shaobo Cheng, Yimei Zhu, and Ivan K. Schuller. "Superconductivity found in meteorites." Proceedings of the National Academy of Sciences 117, no. 14 (March 23, 2020): 7645–49. http://dx.doi.org/10.1073/pnas.1918056117.
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Meteorites can contain a wide range of material phases due to the extreme environments found in space and are ideal candidates to search for natural superconductivity. However, meteorites are chemically inhomogeneous, and superconducting phases in them could potentially be minute, rendering detection of these phases difficult. To alleviate this difficulty, we have studied meteorite samples with the ultrasensitive magnetic field modulated microwave spectroscopy (MFMMS) technique [J. G. Ramírez, A. C. Basaran, J. de la Venta, J. Pereiro, I. K. Schuller,Rep. Prog. Phys.77, 093902 (2014)]. Here, we report the identification of superconducting phases in two meteorites, Mundrabilla, a group IAB iron meteorite [R. Wilson, A. Cooney,Nature213, 274–275 (1967)] and GRA 95205, a ureilite [J. N. Grossman,Meteorit. Planet. Sci.33, A221–A239 (1998)]. MFMMS measurements detected superconducting transitions in samples from each, above 5 K. By subdividing and remeasuring individual samples, grains containing the largest superconducting fraction were isolated. The superconducting grains were then characterized with a series of complementary techniques, including vibrating-sample magnetometry (VSM), energy-dispersive X-ray spectroscopy (EDX), and numerical methods. These measurements and analysis identified the likely phases as alloys of lead, indium, and tin.
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Malheiro Gutiérrez, Xosé Manuel. "Fuego, meteoritos y elefantes. Cruzando fronteras en Educación Infantil." Revista Complutense de Educación 30, no. 3 (July 1, 2019): 919–21. http://dx.doi.org/10.5209/rced.62092.
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Pereira, Carlos Simões, Arthur da Costa Almeida, Carlos Emilio da Rocha Pereira, Luis Diogo da Rocha Pereira, and Pedro Guerreiro Martorano. "Lagos/cratera de meteoritos no município paraense de Curuçá." Brazilian Journal of Development 9, no. 8 (August 15, 2023): 24167–82. http://dx.doi.org/10.34117/bjdv9n8-069.
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A área central do Município Curuçá, no Pará, possui um significativo número de lagos de forma circular, característico de crateras formadas por impacto de asteroides ou meteoritos. Analisando dados de passagens de cometas massivos recentes, determinamos o ano provável de ocorrência desses impactos: 1927. Esses lagos/crateras são notórios pela sua grande quantidade e pequeno diâmetro, se comparados com impactos já ocorridos na Terra. O maior lago tem um diâmetro de 220 m e a rocha que a escavou 23 m. Esse lago tem grande semelhança com outro lago no Canadá, devido a impacto de asteroides o que sugere sua possível origem. Este trabalho faz uma recapitulação de ocorrências desse tipo de evento e a mecânica subjacente. Com as informações de diâmetro dos lagos e das rochas e usando a equação da energia cinética e a densidade estimada das rochas, foi gerada uma tabela com a estimativa da energia desses impactos, de onde concluímos que podem ter causado incêndios florestais e tremor de terra próximo ao ponto de impacto.
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Dudorov, Aleksander E., Dmitry D. Badyukov, Sergey N. Zamozdra, Nick N. Gorkavyi, Olga V. Eretnova, Sergey A. Khaibrakhmanov, Alexander E. Mayer, and Sergey Taskaev. "Meteoroid, Bolide and Meteorite «Chelyabinsk»." Materials Science Forum 845 (March 2016): 273–84. http://dx.doi.org/10.4028/www.scientific.net/msf.845.273.
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This paper presents the brief review of Chelyabinsk group of meteoroid, bolide and meteorite "Chelyabinsk" investigations. Height of the maximum of the main flash of Chelyabinsk bolide is 30 km. Only 1% of meteoroid mass arrived to the Earth surface in the form of meteorites while the most part of meteoroid became dust. During four days the dust had circumnavigated the globe and formed stratospheric dust belt. This new dust belt, located above the Junge aerosol layer, has persisted over at least a three-month period. The mass distribution of found meteorites is lognormal. This shape argues that fragmentation process of initial body happened randomly and in a cascade way. Transparent or translucent mineral filaments firmly linked to the particles were found in the meteoritic dust. In metallic phases of the meteorite mainly Fe-rich compounds exist. Very interesting topics of next research are magnetic properties of Fe-Ni phase, because of cosmic synthesis conditions. Meteoroids like "Chelyabinsk" fall on average once every 30 years. Therefore the problem of "asteroid and comet danger" should be expanded to the problem of "meteoroid, asteroid and comet danger".
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Zucolotto, Maria Elizabeth. "Meteoritos metálicos, uma visão geral: descrição de alguns sideritos brasileiros." Anuário do Instituto de Geociências 16 (January 1, 1993): 87. http://dx.doi.org/10.11137/1993_0_87-87.
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Gómez Sánchez, Tania Fátima. "[Reseña] Fuego, meteoritos y elefantes. Cruzando fronteras en Educación Infantil." Revista Iberoamericana de Educación 78, no. 2 (November 15, 2018): 123–25. http://dx.doi.org/10.35362/rie7823215.
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Sánchez Blanco, C. (2018) Fuego, meteoritos y elefantes. Cruzando fronteras en Educación Infantil. Argentina: Miño Dávila Ed.
Esta obra ofrece una visión sobre la Educación Infantil en el sistema educativo actual. Con esta finalidad se desarrolla el análisis de un informe de investigación- acción que se llevó a cabo en un centro de Educación Infantil y Primaria situado en la ciudad de A Coruña.
Su propósito fundamental es revelar la realidad diaria de niños y niñas que se ven condicionados por las desigualdades sociales que, en ocasiones, pueden conducirles a la exclusión por razones de diversa índole...
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SCHMIEDER, M., H. CHENNAOUI AOUDJEHANE, E. BUCHNER, and E. TOHVER. "Meteorite traces on a shatter cone surface from the Agoudal impact site, Morocco." Geological Magazine 152, no. 4 (March 19, 2015): 751–57. http://dx.doi.org/10.1017/s0016756815000047.
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AbstractThe recently discovered Agoudal impact site in Morocco is a small, eroded impact structure with well-developed shatter cones. A scanning electron microscopic study of a shatter cone surface has revealed the presence of schreibersite – a phosphide very rare on Earth but common in iron meteorites – and Fe–Ni oxides. This is the first reported evidence for primary meteoritic matter adherent to shatter cones and suggests that the Agoudal crater was formed by the impact of an iron meteorite, probably the Agoudal IIAB iron. Shatter cones from other terrestrial impact structures might also hold valuable information about the nature of the impacting projectiles.
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García-Cruz, Cándido Manuel. "Ernst Florens Friedrich Chladni (1756-1827) and the origin of meteorites." Boletín de la Real Sociedad Española de Historia Natural 115 (2021): 131–46. http://dx.doi.org/10.29077/bol.115.e03.garciacruz.
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At the end of the 18th Century, an essay on fireballs, masses of iron or aeroliths that occasionally fell on Earth was published by the German physicist Ernst Florens Friedrich Chladni (1756-1827). In that work, previous conjectures trying to provide an explanation of this phenomenon were refuted, among them several ideas such as processes related to atmospheric humidity, the action of lightning, mergers caused by both forest fires and coal seams, or Moon volcanism. Chladni proposed an alternative theory: the cosmic or extraterrestrial origin of all these materials. His ideas were based on a comparative study among the different existing samples, as well as on the cases which had occurred according to the reports of many eyewitnesses. Chladni considered this phenomenon as being natural in origin, and he implicitly applied the principle of actualism, with which it was possible to explain the past from the present, but also the principle of uniformity of natural laws, both in the space and in the time, with which was possible to stablish a relationship between the structural and mineralogical characteristics of the different samples. Despite the fact that various geochemical works were published in the following years which supported the cosmic origin, the definitive recognition was slow to arrive, even some years after Chladni’s death, but main personalities such as Laplace, Somerville, and Humboldt, among others, had contributed to it. This essay has been considered the most important work in the foundation of Meteoritics. A finales del siglo XVIII, el físico alemán Ernst Florens Friedrich Chladni (1756-1827) publicó un ensayo sobre las bolas de fuego, masas de hierro o aerolitos que ocasionalmente caían sobre la Tierra. En ese trabajo se refutaban conjeturas previas que intentaban explicar este fenómeno mediante procesos relacionados con la humedad atmosférica, la acción de los rayos, fusiones provocadas por incendios de bosques o vetas de carbón, o el volcanismo lunar. Chladni proponía una teoría alternativa: el origen cósmico o extraterrestre de todos estos materiales. Sus ideas se basaban en un estudio comparativo entre las diferentes muestras existentes, y en los casos acaecidos de acuerdo con los informes de muchos testigos oculares. Implícitamente aplicaba a este fenómeno, considerado como natural, el principio del actualismo, con el que era factible explicar el pasado a partir del presente, así como el principio de la uniformidad de las leyes naturales, tanto en el espacio como en el tiempo, lo que permitía relacionar las características estructurales y mineralógicas de las diferentes muestras entre sí. A pesar de que en los años siguientes aparecieron diversos trabajos geoquímicos que apoyaban el origen cósmico, el reconocimiento definitivo tardó en llegar, incluso algunos años tras la muerte de Chladni, con personalidades tan relevantes como Laplace, Somerville y Humboldt. Este ensayo está considerado el trabajo fundacional de la Meteorítica.
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Plotkin, Howard. "Henry A. Ward and the Recovery of the Santa Rosa, Colombia, Meteorite." Earth Sciences History 24, no. 1 (January 1, 2005): 63–80. http://dx.doi.org/10.17704/eshi.24.1.e6j21052q8245023.
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Henry A. Ward (1834-1906), the celebrated founder and owner of Ward's Natural Science Establishment, one of the most interesting and significant North American scientific institutions in the late 19th century, was also perhaps the shrewdest and most enthusiastic meteorite collector of his day. Toward the end of his career, at age 68, he became very interested in a large (612.5 kg) iron meteorite in Santa Rosa, Colombia that was highly venerated by the local townspeople. In an effort to obtain the meteorite in whole or in part—and hopefully clear up the scientific confusion surrounding it—he journeyed to Santa Rosa in the winter of 1906. His attempt to retrieve the meteorite led to a clever plan with local officials, a daring nighttime removal, and a heated legal battle with the national police, but eventually he was allowed to leave Colombia with a large piece of the meteorite. His subsequent investigation of the meteorite is examined, as is our present understanding of it and its relationship to two meteorites found nearby, Rasgatá and Tocavita. Ward's actions shed light on attitudes and practices in natural history collecting at his time, and how scientists grappled with the problem of interpreting meteoritic structure.
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Cooper, George, Andro Rios, and Michel Nuevo. "Monosaccharides and Their Derivatives in Carbonaceous Meteorites: A Scenario for Their Synthesis and Onset of Enantiomeric Excesses." Life 8, no. 3 (August 27, 2018): 36. http://dx.doi.org/10.3390/life8030036.
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Carbonaceous meteorites provide the best glimpse into the solar system’s earliest physical and chemical processes. These ancient objects, ~4.56 billion years old, contain evidence of phenomena ranging from solar system formation to the synthesis of organic compounds by aqueous and (likely) low-temperature photolytic reactions. Collectively, chemical reactions resulted in an insoluble kerogen-like carbon phase and a complex mixture of discrete soluble compounds including amino acids, nucleobases, and monosaccharide (or “sugar”) derivatives. This review presents the documented search for sugars and their derivatives in carbonaceous meteorites. We examine early papers, published in the early 1960s, and note the analytical methods used for meteorite analysis as well as conclusions on the results. We then present the recent finding of sugar derivatives including sugar alcohols and several sugar acids: The latter compounds were found to possess unusual “d” enantiomeric (mirror-image) excesses. After discussions on the possible roles of interstellar grain chemistry and meteorite parent body aqueous activity in the synthesis of sugar derivatives, we present a scenario that suggests that most of Earth’s extraterrestrial sugar alcohols (e.g., glycerol) were synthesized by interstellar irradiation and/or cold grain chemistry and that the early solar disk was the location of the initial enantiomeric excesses in meteoritic sugar derivatives.
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Jull, J. A. Timothy, Devendra Lal, George S. Burr, Philip A. Bland, Alexander W. R. Bevan, and J. Warren Beck. "Radiocarbon Beyond this World." Radiocarbon 42, no. 1 (2000): 151–72. http://dx.doi.org/10.1017/s003382220005311x.
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In this paper, we review the production of radiocarbon and other radionuclides in extraterrestrial materials. This radioactivity can be produced by the effects of solar and galactic cosmic rays on solid material in space. In addition, direct implantation at the lunar surface of 14C and other radionuclides can occur. The level of 14C and other radionuclides in a meteorite can be used to determine its residence time on the Earth's surface, or “terrestrial age”. 14C provides the best tool for estimating terrestrial ages of meteorites collected in desert environments. Age control allows us to understand the time constraints on processes by which meteorites are weathered, as well as mean storage times. Third, we discuss the use of the difference in 14C/12C ratio of organic material and carbonates produced on other planetary objects and terrestrial material. These differences can be used to assess the importance of distinguishing primary material formed on the parent body from secondary alteration of meteoritic material after it lands on the earth.
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Sellés Martínez, José. "M. Doello Jurado y la adquisición del meteorito El Toba por el Museo de Historia Natural en el año 1924." Revista del Museo de La Plata 1 (December 29, 2016): 285–90. http://dx.doi.org/10.24215/25456377e034.
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Se analiza el importante papel que el interés y la diligencia del Dr. M. Doello Jurado tuvieron en la adquisición del meteorito El Toba para la colección del entonces Museo de Historia Natural y las convicciones que lo llevaron a moverse con toda celeridad para que el mismo no fuera destruido ni comercializado inescrupulosamente. Para ello contó con la colaboración del Dr. Antenor Álvarez, médico sanitarista y político que llegó a ser Gobernador de Santiago del Estero, quién le informa de su existencia y el peligro de su destrucción.El trabajo de campo, la nada fácil tarea de transportar las más de cuatro toneladas de hierro desde el monte chaqueño hasta las instalaciones del museo en la calle Bernardo de Irigoyen fue encomendada al naturalista Enrique de Carles, quién –según él mismo señala y agradece- contó para ello con el apoyo de numerosas personas e instituciones como el Ejército Argentino y el Ferrocarril Central Córdoba. Carles es también el responsable de la redacción del informe y memoria de la labor de campo. El informe final que Doello Jurado eleva al Ministro de Justicia e Instrucción Pública termina con un enfático párrafo en el que el autor deja en claro su firme convicción de que el valor científico, y no el material, justifica que los meteoritos caídos y por caer en el territorio de la Nación deban ser considerados de propiedad de ésta y conservados en sus museos para la investigación y la educación del pueblo.
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Gull, Maheen, Tian Feng, and Matthew A. Pasek. "Results of an Eight-Year Extraction of Phosphorus Minerals within the Seymchan Meteorite." Life 12, no. 10 (October 12, 2022): 1591. http://dx.doi.org/10.3390/life12101591.
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In-fall of extraterrestrial material including meteorites and interstellar dust particles during the late heavy bombardment are known to have brought substantial amounts of reduced oxidation-state phosphorus to the early Earth in the form of siderophilic minerals, e.g., schreibersite ((FeNi)3P). In this report, we present results on the reaction of meteoritic phosphide minerals in the Seymchan meteorite in ultrapure water for 8 years. The ions produced during schreibersite corrosion (phosphite, hypophosphate, pyrophosphate, and phosphate) are stable and persistent in aqueous solution over this timescale. These results were also compared with the short-term corrosion reactions of the meteoritic mineral schreibersite’s synthetic analog Fe3P in aqueous and non-aqueous solutions (ultrapure water and formamide). This finding suggests that the reduced-oxidation-state phosphorus (P) compounds including phosphite could be ubiquitous and stable on the early Earth over a long span of time and such compounds could be readily available on the early Earth.
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Hernández-Fernández, S., J. A. Rodríguez-Losada, F. García Talavera, R. Lunar-Hernández, and J. Martínez-Frías. "La colección de meteoritos del Museo de Ciencias Naturales de Tenerife: catalogación internacional y resultados preliminares." Estudios Geológicos 66, no. 1 (June 9, 2010): 5–11. http://dx.doi.org/10.3989/egeol.40170.108.
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Rao, Subba. "A RELOOK AT THE DEFINITION OF A METEORITE." International Journal of Research -GRANTHAALAYAH 8, no. 3 (May 24, 2020): 80–85. http://dx.doi.org/10.29121/granthaalayah.v8.i3.2020.131.
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In Astronomy, a meteorite is a sand- to boulder-sized particle of debris which collides with the earth in the Solar System. Astrobiology Division of NASA asserts that Meteorites are carriers of life building blocks of DNA from space to the earth. Vedic Paradigm and Bhagavad-Gita define that Meteorites are the forms of those persons who fall to be reborn after having enjoyed the fruits of their meritorious deeds in Heaven. Thus, a meteorite appears to be a cosmic and divine dispensation. It is therefore aimed at correlating all these different aspects relating to meteorites and this necessitates a relook at the definition of meteorites for brevity. In this paper, the different aspects pertaining to meteorites are discussed and verified to arrive at a new definition for a ‘Meteorite’. Thus, a ‘Meteorite is a rock from space with DNA molecules enveloped by the imperishable soul of meritorious persons returned from heaven to Earth to be reborn and collides with the Earth in our Solar System and survives the impact with its composition remaining intact after collision’.
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Ivanov, A. V., А. A. Yaroshevskiy, and M. A. Ivanova. "Meteorites minerals." Геохимия 64, no. 8 (September 3, 2019): 869–932. http://dx.doi.org/10.31857/s0016-7525648869-932.
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“The Meteorite Minerals Catalog” is the first edition in Russia prepared in the 21st century. It includes all the minerals found in meteorites, approved by the Committee on New Minerals and MMA Minerals Names, approved before January 1, 2017, and mineral phases. The Russian and English names, chemical composition, as well as meteorites or meteorite groups, which are characterized by the considered minerals are given for all minerals and mineral phases. Mainly the first description of all minerals and phases and references to publications are also given in the Catalog. Samples of minerals whose origin is associated with specific processes are also presented: these are pre-solar meteorite minerals, refractory and ultra-refractory solar condensates, impact minerals of meteorites and products of the terrestrial weathering of meteorites.
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Pearce, Ben K. D., Ralph E. Pudritz, Dmitry A. Semenov, and Thomas K. Henning. "Origin of the RNA world: The fate of nucleobases in warm little ponds." Proceedings of the National Academy of Sciences 114, no. 43 (October 2, 2017): 11327–32. http://dx.doi.org/10.1073/pnas.1710339114.
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Before the origin of simple cellular life, the building blocks of RNA (nucleotides) had to form and polymerize in favorable environments on early Earth. At this time, meteorites and interplanetary dust particles delivered organics such as nucleobases (the characteristic molecules of nucleotides) to warm little ponds whose wet–dry cycles promoted rapid polymerization. We build a comprehensive numerical model for the evolution of nucleobases in warm little ponds leading to the emergence of the first nucleotides and RNA. We couple Earth’s early evolution with complex prebiotic chemistry in these environments. We find that RNA polymers must have emerged very quickly after the deposition of meteorites (less than a few years). Their constituent nucleobases were primarily meteoritic in origin and not from interplanetary dust particles. Ponds appeared as continents rose out of the early global ocean, but this increasing availability of “targets” for meteorites was offset by declining meteorite bombardment rates. Moreover, the rapid losses of nucleobases to pond seepage during wet periods, and to UV photodissociation during dry periods, mean that the synthesis of nucleotides and their polymerization into RNA occurred in just one to a few wet–dry cycles. Under these conditions, RNA polymers likely appeared before 4.17 billion years ago.
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Plotkin, Howard, and Kimberly Tait. "V. Ben Meen and the Riddle of Chubb Crater." Earth Sciences History 30, no. 2 (November 15, 2011): 240–66. http://dx.doi.org/10.17704/eshi.30.2.r02766827l236742.
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Aerial photographs of Chubb Crater, a striking 3.4 km-wide circular basin in the far north of Quebec, led the Ontario prospector Fred W. Chubb to think it might be an extinct volcano, and possibly the site of a diamond-bearing diatreme. V. Ben Meen, the Director of the Royal Ontario Museum of Geology and Mineralogy in Toronto, however, suspected it was an impact crater caused by a meteorite. Meen led two expeditions to the crater in 1950 and 1951. Despite early opposition and the initial absence of corroborative field evidence, he held on to a persistent belief in the crater's meteoritic origin. Later fieldwork ultimately provided strong evidence in support of this view. The discovery of the crater led to the development of a program at the Dominion Observatory in Ottawa to search for additional impact craters on the Canadian Shield, and the development of valuable criteria by which they could be authenticated. The craters discovered through the program fit well on the Baldwin curve relating crater depth to diameter, and lent strong support to the argument for the relationship between the meteoritic origin of lunar craters and terrestrial impact structures. Chubb Crater is of historical importance because it was the first meteorite crater to be recognized in Canada, and the first anywhere to be authenticated in the absence of associated meteorites.
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Gregory, Timothy, Tu-Han Luu, Christopher D. Coath, Sara S. Russell, and Tim Elliott. "Primordial formation of major silicates in a protoplanetary disc with homogeneous 26Al/27Al." Science Advances 6, no. 11 (March 2020): eaay9626. http://dx.doi.org/10.1126/sciadv.aay9626.
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Understanding the spatial variability of initial 26Al/27Al in the solar system, i.e., (26Al/27Al)0, is of prime importance to meteorite chronology, planetary heat production, and protoplanetary disc mixing dynamics. The (26Al/27Al)0 of calcium-aluminum–rich inclusions (CAIs) in primitive meteorites (~5 × 10−5) is frequently assumed to reflect the (26Al/27Al)0 of the entire protoplanetary disc, and predicts its initial 26Mg/24Mg to be ~35 parts per million (ppm) less radiogenic than modern Earth (i.e., Δ′26Mg0 = −35 ppm). Others argue for spatially heterogeneous (26Al/27Al)0, where the source reservoirs of most primitive meteorite components have lower (26Al/27Al)0 at ~2.7 × 10−5 and Δ′26Mg0 of −16 ppm. We measured the magnesium isotope compositions of primitive meteoritic olivine, which originated outside of the CAI-forming reservoir(s), and report five grains whose Δ′26Mg0 are within uncertainty of −35 ppm. Our data thus affirm a model of a largely homogeneous protoplanetary disc with (26Al/27Al)0 of ~5 × 10−5, supporting the accuracy of the 26Al→26Mg chronometer.
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Gałązka-Friedman, Jolanta, Martyna Jakubowska, Marek Woźniak, Katarzyna Brzózka, Agnieszka Grabias, and Krzysztof Szopa. "3." Postępy Fizyki 75, no. 2 (June 20, 2024): 3–16. http://dx.doi.org/10.61947/uw.pf.2024.75.2.3-16.
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57 Fe Mössbauer spectroscopy is one of the most commonly used methods for studying meteorites. The beginning of Mössbauer research in Poland is associated with the Baszkówka meteorite, which fell on 25 August 1994 near Warsaw. The article presents some of the results of 30 years of Mössbauer studies of meteorites by the Polish team. One of the most important achievements of our group is the development of a classification method of ordinary chondrites, which constitute 87% of meteorites found on the earth’s surface. This method, which we call the 4M method (meteorites, Mössbauer spectroscopy, multidimensional discriminant analysis, Mahalanobis distance), is a quantitative method that uses certain systematicity in the Mössbauer spectra of ordinary chondrites. The basic element of the 4M method is the database, which currently consists of the results of Mössbauer measurements of 87 meteorite samples. The article also discusses the new mineral phases identified in the Morasko meteorite. Examples of the use of Mössbauer spectroscopy to distinguish meteorite-like samples from real meteorites are given. Our research plans related to the study of the formation mechanism of ordinary chondrites and the use of Mössbauer spectroscopy in future space missions are also discussed. The latter issues will be undertaken in cooperation with the Mössbauer laboratory at Palacký University in Olomouc (Czech Republic).
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Wagle, Bivu, Kaustuv Regmi, and Krishna Prasad Adhikari. "Study of Fall Meteorites Over a Century (1922-2021)." BMC Journal of Scientific Research 5, no. 1 (December 31, 2022): 97–105. http://dx.doi.org/10.3126/bmcjsr.v5i1.50680.
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Fall meteorites represents to those meteorites whose fall has been witnessed and are later collected from earth surface for further studies. Mass, number of fall events, types, type mass and mass trend of observed fall meteorites are analyzed over a period of recent century (1922-2021) in this paper. The total number of fall meteorites was found to be 706 with total mass of 42800 kg. Decade 2012-2021 and 1932-1941 had the highest number of recorded fall which was 94 times and 89 times respectively. Type L6 meteorite was found to have the greatest number of falls which is 151 times, followed by type H5 and L5 with 109 times and 55 times respectively. The meteorite of type, Iron III AB had the greatest meteorites mass of 23480 kg followed by H5 and L6 with mass 6615 kg and 2347.362 kg respectively. The massive meteorite fall of this century was of Iron III AB type (1947) which weighed 23 tones. The decade 1942-1951 had the highest fall meteorites mass of 24806kg and 1972-1981 had 4858 kg. Various regression model is fitted for the trend analysis of the mass. Over a period of this century, meteorites having mass greater than 100 kg has struck the earth for 32 times while mass greater than 1000 kg has struck for 6 times. The average time between two impacts of meteorite with mass greater than 100kg was calculated to be 3.12 years while mass greater than 1000 kg was found to be 16.6 years.
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Kiker, Thaddaeus J., Nina Hooper, and Martin Elvis. "A Survey of Meteorite-specific Minerals." Research Notes of the AAS 6, no. 1 (January 5, 2022): 3. http://dx.doi.org/10.3847/2515-5172/ac47a5.
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Abstract Dozens of exotic materials are found only in meteorites. These “meteorite minerals” are formed in the solar system's cold, long-lived, proto-planetary disk, in the slowly cooling cores of planetesimals, and in high-speed collisions. To the best of our knowledge no recent published work has aggregated information about minerals only found in meteorites in a comprehensive and machine readable manner. Thus, we have compiled a preliminary catalog of 81 known meteorite minerals from the literature to serve as a stepping stone for a future, more extensive effort. We also explore the distribution of these meteorite minerals by meteorite type.
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Muliawati, Triyana. "CLASSIFICATION OF THE GEOCHEMICAL COMPOSITION OF METEORITE OF PUNGGUR (ASTOMULYO) BY k-NEAREST NEIGHBOR ALGORITHM." VARIANCE: Journal of Statistics and Its Applications 5, no. 2 (October 31, 2023): 185–92. http://dx.doi.org/10.30598/variancevol5iss2page185-192.
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The fall of a meteorite in Astomulyo Village, Punggur, Lampung Province in early 2021 is an interesting topic for further study. This rare object has been suggested to have a unique geochemical composition and a special connection with other meteorites. We aimed to trace its classification by comparing it with other well-known meteorites studied previously. We approach the classification process using the k-nearest neighbor algorithm. The database used 211 represents the geochemical data for each known meteorite group from chemical analyses of meteorites. As a result, we identified that with a k-value = 5 and the proportion of test data 5/95 (in %), the geochemical composition of this meteorite is relatively close to that of the H-type chondrite group with a value accuracy of 91.67%. These results are consistent with the fact that the meteorite of Punggur has a high total iron and metallic composition.
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Bryant, David E., David Greenfield, Richard D. Walshaw, Suzanne M. Evans, Alexander E. Nimmo, Caroline L. Smith, Liming Wang, Matthew A. Pasek, and Terence P. Kee. "Electrochemical studies of iron meteorites: phosphorus redox chemistry on the early Earth." International Journal of Astrobiology 8, no. 1 (January 2009): 27–36. http://dx.doi.org/10.1017/s1473550408004345.
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AbstractThe mineral schreibersite, (Fe,Ni)3P, a ubiquitous component of iron meteorites, is known to undergo anoxic hydrolytic modification to afford a range of phosphorus oxyacids. H-phosphonic acid (H3PO3) is the principal hydrolytic product under hydrothermal conditions, as confirmed here by 31P-NMR spectroscopic studies on shavings of the Seymchan pallasite (Magadan, Russia, 1967), but in the presence of photochemical irradiation a more reduced derivative, H-phosphinic (H3PO2) acid, dominates. The significance of such lower oxidation state oxyacids of phosphorus to prebiotic chemistry upon the early Earth lies with the facts that such forms of phosphorus are considerably more soluble and chemically reactive than orthophosphate, the commonly found form of phosphorus on Earth, thus allowing nature a mechanism to circumvent the so-called Phosphate Problem.This paper describes the Galvanic corrosion of Fe3P, a hydrolytic modification pathway for schreibersite, leading again to H-phosphinic acid as the key P-containing product. We envisage this pathway to be highly significant within a meteoritic context as iron meteorites are polymetallic composites in which dissimilar metals, with different electrochemical potentials, are connected by an electrically conducting matrix. In the presence of a suitable electrolyte medium, i.e., salt water, galvanic corrosion can take place. In addition to model electrochemical studies, we also report the first application of the Kelvin technique to map surface potentials of a meteorite sample that allows the electrochemical differentiation of schreibersite inclusions within an Fe:Ni matrix. Such experiments, coupled with thermodynamic calculations, may allow us to better understand the chemical redox behaviour of meteoritic components with early Earth environments.
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Goldstein, J. I. "Scanning Electron Microscopy And Electron Probe Microanalysis Of Extraterrestrial Materials." Microscopy and Microanalysis 5, S2 (August 1999): 2–3. http://dx.doi.org/10.1017/s1431927600013337.
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One of the first samples analyzed by Castaing in his electron probe microanalyzer (EPMA) some 50 years ago was an iron meteorite. The Widmanstatten pattern microstructure of iron meteorites can be observed at very low magnifications ( Fig. 1). These meteorites are ideal samples for microanalysis because of the Ni gradient which extends over 10 to 1000 microns in the parent taenite phase of these Fe-Ni samples (Fig. 3). The Ni gradient is the result of very slow cooling of the iron meteorite, in terms of millions of years, within a parent'asteroid.The scanning electron microscope (SEM) has been used to characterize the microstructure of meteorites, as well as samples from the moon and mars. For example, the microstructure of the dark etching taenite areas (T in Fig. 1) of the Carleton iron meteorite is shown in Fig 2. In this example, precipitates are observed along original martensite laths which form during the cooling of the iron meteorite at low temperatures.
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El Abassi, Dris, Bouazza Faiz, Abderrahmane Ibhi, and Idris Aboudaoud. "Classification of Iron Meteorites with High Frequency Ultrasonic Waves." Journal of Environmental and Engineering Geophysics 24, no. 2 (June 2019): 277–84. http://dx.doi.org/10.2113/jeeg24.2.277.
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We present the results of an ultrasonic pulse-echo technique and its potential to classify iron meteorites into hexahedrites, octahedrites and ataxites by determining their acoustic impedance and phase velocity. Our technique has been adapted from those used in the field of ultrasonic non-destructive investigation of a variety of materials. The main advantage of our technique is that it does not need any preparation of the meteorites like cutting and etching and therefore is rapid, easy and non-destructive. In essence, a broadband acoustic transducer is used in a monostatic pulse-echo configuration which means that both the transducer and the meteorite sample are located in a water bath and adjusted in the way that the ultrasonic pulse shit the meteorite sample at normal incidence. Then the reflected pulses from the front and rear faces of the meteorite sample are measured with the emitting transducer, digitally recorded and processed to analyze the signal. After Fourier transforming the echoed pulses from the front and the rear face of the meteorite sample, the calculated reflection coefficients yield the phase velocity and the acoustic impedance. Our study investigates a variety of iron meteorites collected in Morocco and other countries and it helps to understand how the nickel content of these meteorites affects the acoustic impedance. It reveals that the acoustic impedance of iron meteorites increases with increasing nickel content, so that a further refinement of our technique might have the potential to classify iron meteorites directly and reliably into hexahedrites, octahedrites and ataxites without destroying them.
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Yamaoka, Hitoshi. "The quinquennial grand shrine festival with the Nogata meteorite." Proceedings of the International Astronomical Union 10, H16 (August 2012): 167. http://dx.doi.org/10.1017/s1743921314005225.
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Though there are many forklore concerning meteorite falls, a few genuine meteorites have been identified. One of them, the Nogata meteorite is related to the oldest recorded meteorite fall (A.D. 861) (Shima et al., 1983).
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Aragonés, Enric, Carlos Martín Escorza, and Jorge Ordaz. "Bólidos observados y meteoritos caídos en la Península Ibérica durante el siglo XVIII." Cuadernos de Estudios del Siglo XVIII, no. 16 (September 29, 2017): 5–50. http://dx.doi.org/10.17811/cesxviii.16.2006.5-50.
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Se presenta un catálogo de los fenómenos meteoríticos observados en la Península Ibérica a lo largo del siglo XVIII. Para ello se ha efectuado un acopio de información publicada e inédita; tras estudiar 33 casos reales o supuestos, se ha confeccionado un catálogo con tres caídas y diez bólidos debidamente contrastados y/o verosímiles. Los resultados presentan un cierto sesgo territorial en razón de la heterogeneidad de los datos de partida; en cuanto a la distribución temporal de los eventos presenta dos máximos: uno en la década de los cincuenta y otro en las dos finales del siglo, los cuales se correlacionan bien con los datos disponibles anivel global. Por otra parte, se ha estudiado la historia terrestre de los meteoritos, así como la evolución de la interpretación de tales fenómenos con el tiempo, desde las conjeturas pre-científi cas a la aceptación de su origen extra-terrestre.Palabras claveMETEORITOS. BÓLIDOS. SIGLO XVIII. ESPAÑA. PORTUGAL.
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Yokoyama, I. "A quantitative consideration of several calderas for study of their formation." Geofísica Internacional 26, no. 4 (October 1, 1987): 487–98. http://dx.doi.org/10.22201/igeof.00167169p.1987.26.4.1100.
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Se han acumulado datos gravimétricos acerca de 22 calderas, la mayoría de ellas en Japón. Para algunas de dichas calderas se dispone también de datos sísmicos por explosión o mediante resultados de perforaciones. Sintetizando estos datos se deducen algunas configuraciones comunes a su estructura subsuperficial. Si bien todas las calderas japonesas son relativamente recientes, fluctuando su edad entre 6 000 y 100 000 años (B.P.), se intenta una discusión general acerca de ellas en conjunto: las deficiencias de masa obtenidas mediante anomalías gravimétricas sobre las calderas presentan una estrecha correlación con sus diámetros. Esta correlación es similar a la de los cráteres originados por meteoritos en Canadá, lo que implica la similitud de la estructura subsuperficial entre las calderas y dichos cráteres.doi: sin doi
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Ibhi, Abderrahmane. "Morocco Meteorite Falls and Finds: Some Statistics." International Letters of Chemistry, Physics and Astronomy 20 (October 2013): 18–24. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.20.18.
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Since the first recorded discovery of a meteorite in 1937 near the Mrirt village (Khenifra, Morocco), a total of 946 authenticated meteorites have been recorded in Morocco. The material, including 10 observed falls, comprises 918 stones, 13 irons and 15 stony-irons. A low ratio of falls to finds (represent only 0.01% of the Moroccan declared meteorites) compared with other countries (e.g., USA 14.3%). However the rate of recovery of meteorites (falls + finds) in Morocco exceeds that of most other countries of similar size and range of climatic conditions. More than 95% of documented meteorites from Morocco have been recovered from Eastern Morocco (Eastern Sahara Moroccan) including many rare types. This Region has proved to be one of the most prolific areas in the world for meteorite finds.
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Ibhi, Abderrahmane. "Morocco Meteorite Falls and Finds: Some Statistics." International Letters of Chemistry, Physics and Astronomy 20 (October 16, 2013): 18–24. http://dx.doi.org/10.56431/p-3961h2.
Full textAbstract:
Since the first recorded discovery of a meteorite in 1937 near the Mrirt village (Khenifra, Morocco), a total of 946 authenticated meteorites have been recorded in Morocco. The material, including 10 observed falls, comprises 918 stones, 13 irons and 15 stony-irons. A low ratio of falls to finds (represent only 0.01% of the Moroccan declared meteorites) compared with other countries (e.g., USA 14.3%). However the rate of recovery of meteorites (falls + finds) in Morocco exceeds that of most other countries of similar size and range of climatic conditions. More than 95% of documented meteorites from Morocco have been recovered from Eastern Morocco (Eastern Sahara Moroccan) including many rare types. This Region has proved to be one of the most prolific areas in the world for meteorite finds.
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Wadhwa, Meenakshi, Timothy J. McCoy, and Devin L. Schrader. "Advances in Cosmochemistry Enabled by Antarctic Meteorites." Annual Review of Earth and Planetary Sciences 48, no. 1 (May 30, 2020): 233–58. http://dx.doi.org/10.1146/annurev-earth-082719-055815.
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At present, meteorites collected in Antarctica dominate the total number of the world's known meteorites. We focus here on the scientific advances in cosmochemistry and planetary science that have been enabled by access to, and investigations of, these Antarctic meteorites. A meteorite recovered during one of the earliest field seasons of systematic searches, Elephant Moraine (EET) A79001, was identified as having originated on Mars based on the composition of gases released from shock melt pockets in this rock. Subsequently, the first lunar meteorite, Allan Hills (ALH) 81005, was also recovered from the Antarctic. Since then, many more meteorites belonging to these two classes of planetary meteorites, as well as other previously rare or unknown classes of meteorites (particularly primitive chondrites and achondrites), have been recovered from Antarctica. Studies of these samples are providing unique insights into the origin and evolution of the Solar System and planetary bodies. ▪ Antarctic meteorites dominate the inventory of the world's known meteorites and provide access to new types of planetary and asteroidal materials. ▪ The first meteorites recognized to be of lunar and martian origin were collected from Antarctica and provided unique constraints on the evolution of the Moon and Mars. ▪ Previously rare or unknown classes of meteorites have been recovered from Antarctica and provide new insights into the origin and evolution of the Solar System.
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Sears, Derek. "The thermoluminescence of meteorites: A brief 2010 perspective." Geochronometria 38, no. 3 (September 1, 2011): 303–13. http://dx.doi.org/10.2478/s13386-011-0036-3.
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AbstractEarly work on meteorite thermoluminescence, influenced by pottery dating and dosimetry applications, demonstrated a relationship between natural thermoluminescence and (1) the orbital perihelion of a meteorite and (2) the terrestrial age (time since fall) of a meteorite. For 14 years natural TL measurements were routinely made on newly recovered Antarctic meteorites to help identify unusual thermal and radiation histories, and to sort them by terrestrial age and perihelion. Two examples of the value of such data are presented, an Antarctic meteorite that underwent a major orbit change prior to fall and the collection mechanics of meteorites at the Lewis Cliff collection site. A second major area of focus for meteorite TL, that has no non-meteorite heritage, is the use of their induced TL to provide an extraordinarily sensitive and quantitative means of exploring metamorphic intensity and palaeothermometry. While especially valuable for unequilibrated ordinary chondrites, these types of measurement have proved useful with virtually every major class of meteorite, asteroidal and planetary. The challenge now is to extend the technique to small particles, micrometeorites, interplanetary dust particles, and cometary particles.
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Battezzati, Agustina. "Piedras: Objetos -cósmicos- encontrados." Revista Comunicación 29, no. 2-2020 (December 16, 2020): 51–57. http://dx.doi.org/10.18845/rc.v29i2-2020.5555.
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La participación y utilización en las producciones artísticas contemporáneas de objetos considerados alguna vez ajenos al campo de las artes es ya un asunto cotidiano. Entre muchos de los proyectos artísticos que trabajan con estos objetos, los trabajos interdisciplinarios combinan diversos conocimientos e intervienen, en ocasiones, espacios fuera del ámbito artístico. En este artículo se investiga, a través del análisis del uso de meteoritos en el trabajo de los artistas argentinos Faivovich y Goldberg, cómo este objeto material es capaz de generar una serie de interferencias y de lazos en las artes y en la sociedad. Además, en el artículo se explora cómo la interdisciplinariedad del proyecto acaba generando una reconfiguración recíproca entre la escena artística y las instituciones científicas y estatales con las que trabajan los artistas.
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Ceballos, Yasmani, Johanset Orihuela, and Carlos Rafael Borges-Sellén. "Checklist of cuban meteor-wrongs." Revista de la Sociedad Geológica de España 37, no. 1 (June 27, 2024): 32–44. http://dx.doi.org/10.55407/rsge.104724.
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This research addresses the prevalent issue of misidentifying terrestrial rocks and man-made materials as meteorites in Cuba, a region with rich geological diversity that complicates such distinctions. The objective is to systematically differentiate true meteorites from pseudometeorites, or “meteor-wrongs”, through an analysis of collected specimens across the island. Employing a multifaceted methodology, including macroscopic examination, basic magnetism testing, density measurement, and advanced analytical techniques like X-ray fluorescence (XRF) and Scanning Electron Microscopy/Energy Dispersive Spectroscopy (SEM/EDS), this study elucidates the distinguishing features of meteoritic versus non-meteoritic materials. Our findings reveal a predominance of igneous rocks, particularly basalt, and ferrosilicon alloys misidentified as meteorites. This work emphasizes the importance of curatorial documentation and accessibility of problematic specimens for scientific investigation, advocating for a culture of precision and curiosity in geoscientific research.