Academic literature on the topic 'Jeffbenite'

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Journal articles on the topic "Jeffbenite"

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Nestola, Fabrizio, Antony D. Burnham, Luca Peruzzo, et al. "Tetragonal Almandine-Pyrope Phase, TAPP: finally a name for it, the new mineral jeffbenite." Mineralogical Magazine 80, no. 7 (2016): 1219–32. http://dx.doi.org/10.1180/minmag.2016.080.059.

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AbstractJeffbenite, ideally Mg3Al2Si3O8, previously known as tetragonal-almandine-pyrope-phase ('TAPP’), has been characterized as a new mineral from an inclusion in an alluvial diamond from São Luiz river, Juina district of Mato Grosso, Brazil. Its density is 3.576 g/cm3 and its microhardness is ∼7. Jeffbenite is uniaxial (-) with refractive indexes ω = 1.733(5) and ε = 1.721 (5). The crystals are in general transparent emerald green.Its approximate chemical formula is (Mg262Fe2+0.27)(Al186Cr016)(Si2 g2Al018)O12 with very minor amounts of Mn, Na and Ca. Laser ablation ICP-MS showed that jeffb
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Zedgenizov, D. A., A. L. Ragozin, H. Kagi, H. Yurimoto, and V. S. Shatsky. "The inclusions of SiO2 in sublithospheric diamonds." Геохимия 64, no. 9 (2019): 948–57. http://dx.doi.org/10.31857/s0016-7525649948-957.

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The specific features of the mineralogy of SiO2 inclusions in sublithospheric diamonds are described in this study. Such diamonds are characterized by a complex growth history with stages of growth and dissolution and postgrowth processes of deformation and crushing. The nitrogen content in all studied crystals does not exceed 71 ppm and nitrogen is detected only as B-defects. The carbon isotope composition of diamonds varies widely from -26.5 to -6.7 ‰ of δ13С. SiO2 inclusions associate with omphacitic clinopyroxenes, majoritic garnets, CaSiO3, jeffbenite and ferropericlase. All SiO2 inclusio
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Pekov, Igor V., Natalia N. Koshlyakova, Natalia V. Zubkova, et al. "A Natural Vanadate–Arsenate Isomorphous Series with Jeffbenite-Type Structure: New Fumarolic Minerals Udinaite, NaMg4(VO4)3, and Arsenudinaite, NaMg4(AsO4)3." Minerals 12, no. 7 (2022): 850. http://dx.doi.org/10.3390/min12070850.

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Two new isostructural minerals udinaite and arsenudinaite with the end-member formulae NaMg4(VO4)3 and NaMg4(AsO4)3, respectively, are found in the Arsenatnaya fumarole, Tolbachik volcano, Kamchatka, Russia. They are associated with one another and anhydrite, diopside, hematite, schäferite, berzeliite, svabite, calciojohillerite, tilasite, reznitskyite, ludwigite, rhabdoborite-group borates, forsterite, magnesioferrite, fluorapatite, pliniusite, and powellite. Both minerals occur as equant tetragonal prismatic–dipyramidal crystals up to 0.15 mm, aggregates up to 1 cm and interrupted crusts up
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Kampf, Anthony R., Barbara P. Nash, Jakub Plášil, Jason B. Smith, and Mark N. Feinglos. "Niasite and johanngeorgenstadtite, Ni<sup>2+</sup><sub>4.5</sub>(AsO<sub>4</sub>)<sub>3</sub> dimorphs from Johanngeorgenstadt, Germany." European Journal of Mineralogy 32, no. 3 (2020): 373–85. http://dx.doi.org/10.5194/ejm-32-373-2020.

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Abstract. Niasite (IMA2019-105) and johanngeorgenstadtite (IMA2019-122) are Ni4.52+(AsO4)3 dimorphs from Johanngeorgenstadt, Saxony, Germany. The two new minerals occur in association with one another and with aerugite, bunsenite, quartz, rooseveltite and xanthiosite. This mineral assemblage is apparently secondary in origin and most likely formed from the breakdown of primary nickeline under dry (low relative humidity) and oxidizing (high oxygen fugacity) conditions. Both minerals are found in sugary aggregates of irregular, rounded grains or short prisms. Niasite properties are as follows: c
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Qin, Fei, Fei Wang, Joseph R. Smyth, Dongzhou Zhang, Jingui Xu, and Steven D. Jacobsen. "Thermoelastic Properties of Fe3+‐Rich Jeffbenite and Application to Superdeep Diamond Barometry." Geophysical Research Letters 51, no. 6 (2024). http://dx.doi.org/10.1029/2023gl106908.

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AbstractJeffbenite (Mg3Al2Si3O12) is a tetragonal phase found in so far only in superdeep diamonds, and its thermoelastic parameters are a prerequisite for determining entrapment pressures as it is regarded as a potential indicator for superdeep diamonds. In this study, the thermoelastic properties of synthetic Fe3+‐jeffbenite were measured up to 33.7 GPa and 750 K. High‐temperature static compression data were fitted, giving (∂KT0/∂T)P = −0.0107 (4) GPa/K and αT = 3.50 (3) × 10−5 K−1. The thermoelastic properties and phase stability are applied to modeling isomekes, or P‐T paths intersecting
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Nestola, Fabrizio, Mauro Prencipe, and Donato Belmonte. "Mg3Al2Si3O12 jeffbenite inclusion in super-deep diamonds is thermodynamically stable at very shallow Earth’s depths." Scientific Reports 13, no. 1 (2023). http://dx.doi.org/10.1038/s41598-022-27290-9.

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AbstractJeffbenite (having the same chemical composition of pyrope, ~ Mg3Al2Si3O12, and also known as TAPP phase) is a mineral inclusion only found in diamonds formed between about 300 and 1000 km depth) and is considered a stable phase in the transition zone (410–660 km depth) and/or in the shallowest regions of the lower mantle (around 660–700 km depth). This rare and enigmatic mineral is considered to be a pressure marker for super-deep diamonds and therefore it has a key role in super-deep diamond research. However, the pressure–temperature stability fields for Mg3Al2Si3O12 jeffbenite is u
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"Ferromagnesian jeffbenite synthesized at 15 GPa and 1200ºC." American Mineralogist, April 1, 2021. http://dx.doi.org/10.2138/am-2021-7852.

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Smith, Charlene M., George H. Beall, and John P. Finkeldey. "Formation of the high pressure jeffbenite phase from glass at ambient pressure." Scientific Reports 15, no. 1 (2025). https://doi.org/10.1038/s41598-025-02967-z.

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Nestola, Fabrizio, Mauro Prencipe, and Donato Belmonte. "Author Correction: Mg3Al2Si3O12 jeffbenite inclusion in super-deep diamonds is thermodynamically stable at very shallow Earth’s depths." Scientific Reports 13, no. 1 (2023). http://dx.doi.org/10.1038/s41598-023-30111-2.

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Wang, Fei, Elizabeth C. Thompson, Dongzhou Zhang, et al. "High-pressure crystal structure and equation of state of ferromagnesian jeffbenite: implications for stability in the transition zone and uppermost lower mantle." Contributions to Mineralogy and Petrology 176, no. 11 (2021). http://dx.doi.org/10.1007/s00410-021-01850-0.

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Dissertations / Theses on the topic "Jeffbenite"

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Anzolini, Chiara. "Depth of formation of super-deep diamonds." Doctoral thesis, Università degli studi di Padova, 2018. http://hdl.handle.net/11577/3424577.

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Diamonds, and the mineral inclusions they trap during growth, are pristine samples from the mantle that reveal processes in the deep Earth, provided the depth of formation of an inclusion-diamond pair being known. The majority of diamonds are lithospheric, while the depth of origin of super-deep diamonds (SDDs), which represent only 6% of the total, is uncertain. SDDs are considered to be sub-lithospheric, with formation from 300 to 800 km depth, on the basis of the inclusions trapped within them, which are believed to be the products of retrograde transformation from lower-mantle or transitio
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