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Journal articles on the topic 'Fluorapatite'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Wang, Xianchen, Qin Zhang, Song Mao, and Wei Cheng. "A Theoretical Study on the Electronic Structure and Floatability of Rare Earth Elements (La, Ce, Nd and Y) Bearing Fluorapatite." Minerals 9, no. 8 (2019): 500. http://dx.doi.org/10.3390/min9080500.

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Calcium atoms are often replaced by rare earth elements (REEs) in the lattice of fluorapatite (Ca10F2(PO4)6), making the phosphate ore an important potential rare earth resource. In this paper, the electronic properties of REEs (La, Ce, Nd and Y) bearing fluorapatite crystals have been investigated by density functional theory. Results of calculation indicated that the existence of REEs increased the cell parameters of fluorapatite in varying degrees. The REEs substitution made the Fermi level of fluorapatite to move to higher energy levels, making it easier to accept electrons. Except for Y,

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2

Rajesh, H. M., and M. Santosh. "Fluorapatite from Alkaline Pegmatites of the Kerala Khondalite Belt: A Petrologic and Fluid Inclusion Study." Journal Geological Society of India 48, no. 6 (1996): 637–46. http://dx.doi.org/10.17491/jgsi/1996/480604.

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Abstract We report the occurrence of primary apatite crystals in association with graphite within alkaline pegmatite dykes in the Kerala Khondalite Belt (KKB). Petrologic and X-ray diffraction studies identify the mineral to be fluorapatite. Fluid inclusion studies show that the fluorapatites contain abundant CO2-rich inclusions with densities in the range of 0.85-0.72 gcm-3. A subsequent generation of trail-bound CO2-HP inclusions with low salinity were entrapped along hydraulic cracks. The abundance of CO2-rich inclusions, and the intimate association of fluorapatite with fluid-precipitated

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3

Braun, I., and M. Raith. "Occurrence of Fluorapatite in Granitic Veins from the Kerala Khondalite Belt, Southern India." Journal Geological Society of India 48, no. 6 (1996): 629–36. http://dx.doi.org/10.17491/jgsi/1996/480603.

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Abstract This paper presents the first description of fluorapatite in rocks of the Kerala Khondalite Belt in southern India. The fluorapatites occur either dispersed or aggregated in granitic and pegmatitic veins which intruded into high-grade metamorphic gamet-biotite gneisses. Microtextures indicate an exclusively magmatic origin for the fluorapatites and the strong zoning of F and OH points to a change in fluid/melt composition during apatite crystallization. The P-T conditions of melt crystallization are estimated to be in the range of 750-800°C and =5 kbar. The origin of the fluorapatite

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4

Zhang, Jingkun, Zhiyun Xiao, and Hongbo Zhang. "Selective Flotation Behavior of Dolomite from Fluorapatite Using Hydroxy Ethylene Diphosphonic Acid as High-Efficiency Depressant." Minerals 12, no. 12 (2022): 1633. http://dx.doi.org/10.3390/min12121633.

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In the reverse flotation of fluorapatite and dolomite, high-efficiency depressors of fluorapatite have received considerable attention. In this paper, the depression mechanism of hydroxy ethylene diphosphonic acid (HEDP) was studied for the first time as a novel fluorapatite depressant on the surface of fluorapatite. The effect of HEDP on the flotation behavior of the two minerals was studied by single and mixed minerals in flotation tests. HEDP exhibited an excellent depression effect on fluorapatite flotation, whereas its adsorption on dolomite surface was minimal. Fluorapatite and dolomite

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5

Kuo, Tsung-Yuan, Chi-Sheng Chien, Cheng-Wei Liu, and Tzer-Min Lee. "Comparative investigation into effects of ZrO2 and Al2O3 addition in fluorapatite laser-clad composite coatings on Ti6Al4V alloy." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 233, no. 2 (2018): 157–69. http://dx.doi.org/10.1177/0954411918816113.

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Composite coatings consisting of fluorapatite mixed with 20 wt% yttria (3 mol%) stabilized cubic phase zirconia (c-ZrO2, 3Y-TZP) or 20 wt% alumina (α-Al2O3) were deposited on Ti6Al4V substrates using a Nd:YAG laser cladding system. The interface morphology, phase composition, micro-hardness and biological properties of the two coatings were examined and compared. The results showed that the fluorapatite/Al2O3 specimen underwent a greater inter-diffusion at the interface between the coating layer and the transition layer than the fluorapatite/ZrO2 specimen. During the cladding process, the ZrO2

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6

Ghaemi, Mohammad, Sergiy Sayenko, Volodymyr Shkuropatenko, et al. "The effect of Sr and Mg substitutions on structure, mechanical properties and solubility of fluorapatite ceramics for biomedical applications." Processing and Application of Ceramics 16, no. 3 (2022): 218–29. http://dx.doi.org/10.2298/pac2203218g.

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Ionic substitutions play important role in the modifications of biological apatites. Recently, the attention has been focused on the co-doping effects on functional properties of apatite based biomaterials. In this research work, the dense samples of fluorapatites, Ca10(PO4)6F2 and Ca8MgSr(PO4)6F2, were produced after sintering at 1250?C for 6 h in air. Structural characterization, carried out with XRD, IR, Raman and SEM, confirmed the formation of dense and homogeneous structure with main fluorapatite and small amount of Ca3(PO4)2 phase. The presented results also demonstrate the stability of

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7

Myšľan, Pavol, Peter Ružička, Tomáš Mikuš, and Miroslav Hain. "3D distribúcia minerálnych inklúzií v granátoch z lokalít Lesné - Potičky a Beňatinská voda (Slovenská republika)." Bulletin Mineralogie Petrologie 28, no. 2 (2020): 246–60. http://dx.doi.org/10.46861/bmp.28.246.

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Visualization of garnets and their mineral inclusions was performed by X-ray microtomography by reconstructing 3D image from 1800 measured 2D X-ray projections. Visualization procedure of 3D distribution of mineral inclusions was based on the different absorption of X-ray radiation between the host garnet and mineral inclusions. 3D visualization provided a realistic picture of a distribution of the 126 identified mineral inclusions in garnet from rhyolite and rhyodacite Beňatinská voda and 21 inclusions in garnet from Lesné - Potičky (Slovak Republic). Composition of garnet from locality Lesné

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8

Gall, Quentin, William J. Davis, David G. Lowe, and Quinn Dabros. "Diagenetic apatite character and in situ ion microprobe U–Pb age, Keeseville Formation, Potsdam Group, New York State." Canadian Journal of Earth Sciences 54, no. 7 (2017): 785–97. http://dx.doi.org/10.1139/cjes-2016-0195.

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An occurrence of diagenetic fluorapatite cement is documented within the Cambro-Ordovician Keeseville Formation, Potsdam Group, near Chateaugay in New York State. The fluorapatite cement occurs as stratiform layers within ephemeral fluvial quartz arenites, which have been reworked by aeolian processes prior to burial. The paragenetic sequence includes the following: compaction of dust-rimmed grains → quartz cementation → minor kaolinite → fluorapatite cementation followed by secondary dissolution porosity and telogenetic hematite cementation. Mesogenetic illitization of kaolinite may have take

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9

Tang, Yuan, Qianqian Li, Hui Fang, et al. "The Flotation Depression Mechanism of Fluorapatite and Dolomite Using Fulvic Acid as a Green Depressant in Weakly Acidic Conditions." Processes 13, no. 7 (2025): 2089. https://doi.org/10.3390/pr13072089.

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Natural phosphate ores frequently contain calcium–magnesium carbonate minerals as gangue components. Their separation from target phosphate minerals poses significant challenges due to analogous surface characteristics. The flotation differentiation between fluorapatite and dolomite remains a key research focus in mineral processing. In conventional collector systems, selective depressants critically govern separation efficiency, as their interfacial specificity directly determines beneficiation outcomes. The selective depression behavior of fulvic acid (FA) in modulating fluorapatite–dolomite

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10

Zheng, Huifang, Yingxin Chen, Xiaoqing Weng, Yanfeng Jin, Richard M. Kasomo, and Shunfu Ao. "Flotation Separation of Dolomite from Fluorapatite Using Sodium Dodecyl Benzene Sulfonate as the Efficient Collector under Low Temperature." Minerals 12, no. 2 (2022): 228. http://dx.doi.org/10.3390/min12020228.

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Flotation is the most often employed process to achieve the selective removal of contaminants from the raw materials used in the manufacturing of phosphate fertilizer. However, sodium oleate (NaOL), as a typical collector, is ineffective because of its low collecting ability under low temperature. As a result, developing and implementing feasible alternatives is critical for the long-term output of mines. In this study, sodium dodecyl benzene sulfonate (SDBS), a low-cost and freely soluble reagent under low temperature was used to examine its collecting ability and selectivity in a fluorapatit

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11

Thủy, Nguyễn Thị, and Nguyễn Thị Hồng Nụ. "Characteristics of phosphate phase (fluorapatite and monazite) in the South Nam Xe carbonatites, Northwest Vietnam." Hue University Journal of Science: Earth Science and Environment 126, no. 4B (2017): 97. http://dx.doi.org/10.26459/hueuni-jese.v126i4b.4293.

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<p>This paper presents characteristics of appearance and mineral chemistry of phosphate phase, including fluorapatite and monazite in the South Nam Xe carbonatite dykes in Northwest Vietnam. These minerals occur in both calcio- and ferrocarbonatites in various modes. Most of the fluorapatites in the calciocarbonatites are oblong to elongated, and have sharp contacts with calcite, aegirine and phlogopite suggesting their primary origin; whereas those in the ferrocarbonatites are commonly present in forms of stubby to perfect hexagonal prismatic crystals, which partly replaced by the monaz

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12

Liu, Jiandong, Binbin Peng, Liping Zhao, Fengwei Bai, and Zhiwu Lei. "Selection of an Appropriate Depressant in Flotation Separation of Molybdenum Oxide from Fluorapatite." Minerals 11, no. 10 (2021): 1110. http://dx.doi.org/10.3390/min11101110.

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The depressive efficiency of sodium silicate, sodium hexametaphosphate, and tartaric acid on the flotation separation of molybdenum oxide from fluorapatite were examined using cetylpyridinium chloride (CPC) as the collector. The corresponding depression mechanisms of all three depressants were studied with the use of laboratory measurements. Individual mineral flotation tests and adsorption studies showed that all these depressants have a higher depression effect on fluorapatite than molybdenum oxide. Sodium hexametaphosphate has the strongest depression effect on fluorapatite and can reduce t

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13

Stanic, Vojislav, Mia Omerasevic, Dragosav Mutavdzic, et al. "Synthesis and structural properties of europium-doped fluorapatite nanoparticles as a promising luminescent biomaterial." Science of Sintering, no. 00 (2024): 42. http://dx.doi.org/10.2298/sos240715042s.

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Europium-doped fluorapatite Ca10-x(PO4)6F2:xEu3+ (x = 0.05, 0.1 and 0.5) nanoparticles were successfully synthesised by a coprecipitation method at room temperature and calcination at 700?C. Characterisation of samples using XRD, TEM, TGA-DTA, FTIR and photoluminescence spectroscopy showed that the obtained calcium deficient fluorapatite nanoparticles exhibit a high degree of crystalline disorder, i.e. Eu doping leads to a remarkable structural amorphisation of fluorapatite. The crystallinity and crystallite size of the obtained samples decreased with the increase of Eu doping. The lattice par

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14

Jones, Steven P., Godwin C. Y. Cheuk, George Georgiou, and David R. Moles. "Comparison of fluoridated apatites with pure hydroxyapatite as potential biomimetic alternatives to enamel for laboratory-based bond strength studies." Australasian Orthodontic Journal 25, no. 1 (2009): 12–18. http://dx.doi.org/10.2478/aoj-2009-0003.

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Abstract Aim To investigate whether fluoridated apatites have a shear bond strength which more closely equates to that of natural enamel than pure hydroxyapatite, making them potentially useful as biomimetic alternatives to natural enamel for ex vivo laboratory bonding studies. Methods Discs of pure hydroxyapatite, pure fluorapatite and a 1:1 mixture of hydroxyapatite-fluorapatite were produced by cold uni-axial pressing. The discs were sintered at 1300°C, embedded in epoxy resin, ground and polished. X-ray diffraction technique was used to analyse the purity of the apatites. Scanning electron

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15

Tulyaganov, D. U., and R. Ya Khodakovskaya. "Glass-ceramic biomaterials based on the fluorapatite-anorthite and fluorapatitie-diopside systems." Glass and Ceramics 48, no. 5 (1991): 221–22. http://dx.doi.org/10.1007/bf00676772.

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16

Wang, Gaoqi, Yunkai Li, Shouren Wang, Xuefeng Yang, and Yujing Sun. "Two-Body and Three-Body Wear Behavior of a Dental Fluorapatite Glass-Ceramic." Coatings 9, no. 9 (2019): 580. http://dx.doi.org/10.3390/coatings9090580.

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As a veneering porcelain coating of dental prosthesis, two-body and three-body wear behavior of dental glass-ceramic with the main crystalline phase of fluorapatite has not been comprehensively studied. In this work, a self-made fluorapatite glass-ceramic was synthesized and the mechanical and tribological performances of the glass-ceramic were tested, comparing with a commercial feldspathic glass-ceramic. The friction and wear experiments were performed between disk-shaped glass-ceramics and natural teeth in two-body (dry, water, saliva) and three-body (slurry) modes, respectively. Results sh

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17

Nachev, Ivan. "Phosphate minerals from Albian phosphorites in Bulgaria." Geologica Balcanica 32, no. 2-4 (2002): 191–97. http://dx.doi.org/10.52321/geolbalc.32.2-4.191.

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Results from X-ray diffraction analyses of Albian phosphorites from deposits Sanadinovo, Dekoy and Brushlen indicate presence mainly of fluorapatite and partly of chlorapatite and carbonate fluorapatite (francolite). The microprobe analyses of phosphate grains, coatings, cements, ammonite, wood, and shark tooth determined the following contents (in weight %): 26,65-41,02 P2O5 45,19-57,17 CaO, 2,58-4,64 F, up to 0,80 CI, and silicate components from the admixtures in phosphate minerals. Fifteen crystallochemical formulae were calculated. They are characteristic with Ca9.54-9.58[PO4]5.77-5.78FI1

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18

Malysheva, Khrystyna, Konrad Kwaśniak, Iaroslav Gnilitskyi, et al. "Functionalization of Polycaprolactone Electrospun Osteoplastic Scaffolds with Fluorapatite and Hydroxyapatite Nanoparticles: Biocompatibility Comparison of Human Versus Mouse Mesenchymal Stem Cells." Materials 14, no. 6 (2021): 1333. http://dx.doi.org/10.3390/ma14061333.

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A capability for effective tissue reparation is a living requirement for all multicellular organisms. Bone exits as a precisely orchestrated balance of bioactivities of bone forming osteoblasts and bone resorbing osteoclasts. The main feature of osteoblasts is their capability to produce massive extracellular matrix enriched with calcium phosphate minerals. Hydroxyapatite and its composites represent the most common form of bone mineral providing mechanical strength and significant osteoinductive properties. Herein, hydroxyapatite and fluorapatite functionalized composite scaffolds based on el

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19

Cook, Robert B. "Connoisseurs's Choice: Fluorapatite." Rocks & Minerals 68, no. 2 (1993): 112–14. http://dx.doi.org/10.1080/00357529.1993.9926537.

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20

Simon, Paul. "Fluorapatite-Gelatine Nanocomposites." Imaging & Microscopy 11, no. 1 (2009): 38–41. http://dx.doi.org/10.1002/imic.200990015.

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21

Nikčević, I., V. Jokanović, M. Mitrić, Z. Nedić, D. Makovec, and D. Uskoković. "Mechanochemical synthesis of nanostructured fluorapatite/fluorhydroxyapatite and carbonated fluorapatite/fluorhydroxyapatite." Journal of Solid State Chemistry 177, no. 7 (2004): 2565–74. http://dx.doi.org/10.1016/j.jssc.2004.03.024.

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22

Hill, Robert G., Adam Calver, Stephen Skinner, Artemis Stamboulis, and Robert V. Law. "A MAS-NMR and Combined Rietveldt Study of Mixed Calcium/Strontium Fluorapatite Glass-Ceramics." Key Engineering Materials 309-311 (May 2006): 305–8. http://dx.doi.org/10.4028/www.scientific.net/kem.309-311.305.

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Strontium is one of the most common substituents in apatite crystals. The presence and behavior of Sr in apatite-group phases are of considerable significance in biology. The present paper investigates the substitution of strontium for calcium in a glass-ceramic of the following composition 4.5SiO23Al2O31.5P2O54CaO1CaF2. The glasses were characterized using Differential Thermal Analysis (DTA), X-ray powder diffraction (XRD), neutron diffraction (ND) and 19F Resonance Magic Angle Spinning Nuclear Magnetic Resonance (MAS-NMR). The all calcium glass crystallized to calcium fluorapatite (Ca5(PO4)3

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23

Harlov, D. E., H. J. Förster, and C. Schmidt. "High P-T experimental metasomatism of a fluorapatite with significant britholite and fluorellestadite components: implications for LREE mobility during granulite-facies metamorphism." Mineralogical Magazine 67, no. 1 (2003): 61–72. http://dx.doi.org/10.1180/0026461036710084.

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AbstractA LREE-, Si-, S-enriched fluorapatite with ∼7.7 wt.% LREE2O3, 5.3 wt.% SiO2 and 3.5 wt.% SO3 from the Mushugai-Khuduk REE deposit, southern Mongolia, has been experimentally metasomatized in pure H2O at 900°C and 1000 MPa. Despite the high LREE content, inclusions or rim grains of monazite did not form during fluid-induced metasomatism. Under high-contrast BSE imaging, the reacted fluorapatite presents a mottled appearance with light, moderate and dark areas and hosts large fluid inclusions containing anhydrite as the solid phase. Dark areas show moderate depletion in all the LREE. Mea

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Petkovic-Benazzouz, Marija, Igor Radovic, Dusan Milojkov, and Goran Janjic. "Molecular docking's pioneering role in materials science. Metal ion site-preference in fluorapatite." Journal of the Serbian Chemical Society, no. 00 (2025): 28. https://doi.org/10.2298/jsc250202028b.

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Originally created for biological systems, molecular docking has proven to be versatile by being used to predict metal ion binding locations and affinities in materials. By using this novel approach, it was possible to estimate the binding energies of Ca2+, Sr2+, Mn2+, Cu2+, and Pr3+ ions for two different calcium sites in fluorapatite. The data obtained from the crystal structures of doped fluorapatites showed a good agreement with the docking research. The interpretation of docking results was made easier by combining results from DFT calculations with geometrical analysis of crystal structu

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Nan, Nan, Yimin Zhu, Yuexin Han, and Jie Liu. "Molecular Modeling of Interactions between N-(Carboxymethyl)-N-tetradecylglycine and Fluorapatite." Minerals 9, no. 5 (2019): 278. http://dx.doi.org/10.3390/min9050278.

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In this study, a flotation collector N-(carboxymethyl)-N-tetradecylglycine (NCNT) was introduced for the purpose of energy-saving, and its adsorption ability on a fluorapatite (001) surface was investigated by density functional theory calculation. The results of frontier molecular orbital analysis of NCNT and adsorption energy between NCNT and fluorapatite (FAp) showed that NCNT possessed better activity and stronger interactions in the reagent–FAp system than oleic acid (OA). A simulation model revealed that the adsorption positions of NCNT on the fluorapatite surface are calcium atoms, at w

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Dumańska-Słowik, Magdalena, Bartosz Budzyń, Wiesław Heflik, and Magdalena Sikorska. "Stability relationships of REE-bearing phosphates in an alkali-rich system (nepheline syenite from the Mariupol Massif, SE Ukraine)." Acta Geologica Polonica 62, no. 2 (2012): 247–65. http://dx.doi.org/10.2478/v10263-012-0013-z.

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ABSTRACT Dumańska-Słowik, M., Budzyń, B., Heflik, W. and Sikorska, M. 2012. Stability relationships of REE-bearing phosphates in an alkali-rich system (nepheline syenite from the Mariupol Massif, SE Ukraine). Acta Geologica Polonica, 62 (2), 247-265. Primary REE-enriched fluorapatite and fluorbritholite-(Ce) in nepheline syenite from the Mariupol Massif (SE Ukraine), contain textural and chemical evidence of late- to post-magmatic metasomatic alteration. REE mobilization and replacement of the primary phases by fluid-mediated coupled dissolution-reprecipitation strongly depended on the distanc

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Alves, Felipe Emerson André, Reiner Neumann, Ciro Alexandre Ávila, and Fabiano Richard Leite Faulstich. "Monazite-(Ce) and xenotime-(Y) microinclusions in fluorapatite of the pegmatites from the Volta Grande mine, Minas Gerais state, southeast Brazil, as witnesses of the dissolution–reprecipitation process." Mineralogical Magazine 83, no. 4 (2019): 595–606. http://dx.doi.org/10.1180/mgm.2019.43.

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AbstractFluorapatite with monazite-(Ce) and xenotime-(Y) microinclusions occurs in the lithium–caesium–tantalum pegmatite body A of the Volta Grande mine, Minas Gerais state, Southeast Brazil. The fluorapatite displays faint zoning, detected mainly by cathodoluminescence. Electron probe and laser ablation analyses indicate that zoning in the fluorapatite corresponds to variation in Mn and rare-earth element (REE) content. Such compositional variation is attributed to partial removal of the REE from the fluorapatite structure during a dissolution–reprecipitation process, forming monazite-(Ce) a

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Loy, Chee W., Khamirul A. Matori, Norhazlin Zainuddin, et al. "Crystallographic characterization of fluorapatite glass-ceramics synthesized from industrial waste." Powder Diffraction 32, S2 (2017): S61—S65. http://dx.doi.org/10.1017/s088571561700094x.

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A series of phase transformations of a novel fluoroaluminosilicate glass forming a range of fluorapatite glass-ceramics on sintering are reported. The sintering process induces formation of fluorapatite, mullite, and anorthite phases within the amorphous silicate matrices of the glass-ceramics. The fluoroaluminosilicate glass, SiO2–Al2O3–P2O5–CaO–CaF2, is prepared from waste materials, such as rice husk ash, pacific oyster shells, and disposable aluminium cans. The thermally induced crystallographic and microstructure evolution of the fluoroaluminosilicate glass towards the fluorapatite glass-

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Morin, Guillaume, Thierry Allard, Etienne Balan, Philippe Ildefonse, and Georges Calas. "Native Cd+ in sedimentary fluorapatite." European Journal of Mineralogy 14, no. 6 (2002): 1087–94. http://dx.doi.org/10.1127/0935-1221/2002/0014-1087.

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Charlena, Charlena, Yessie Widya Sari, and Wulan Islamia. "VARIATION OF SINTERING TEMPERATURE IN THE SYNTHESIS OF FLUORAPATITE FROM SNAIL SHELLS (Achatina fulica) USING THE SOL-GEL METHOD." Indonesian Journal of Pure and Applied Chemistry 6, no. 3 (2023): 152. http://dx.doi.org/10.26418/indonesian.v6i3.67697.

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Dental caries can cause porous cavities and even broken teeth, necessitating natural teeth extraction and replacement with implants. Fluorapatite, a dental implant material, can be synthesized from snail shells containing 98% calcium carbonate. This study aims to identify the characteristics of fluorapatite and determine the effect of variations in sintering temperature on the synthesis of fluorapatite made from snail shells using the sol-gel method. Variations of sintering temperature used are 700, 900, and 1100 °C. The results showed that fluorapatite synthesized with the sintering temperatu

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Silva, G. P. S., M. C. S. Nunes, C. Ulsen, R. Künzel, E. M. Yoshimura, and N. M. Trindade. "Thermoluminescence of fluorapatite mineral." Journal of Luminescence 231 (March 2021): 117802. http://dx.doi.org/10.1016/j.jlumin.2020.117802.

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Kherifi, D., H. Belhouchet, S. Ramesh, et al. "Sintering behaviour of fluorapatite–silicate composites produced from natural fluorapatite and quartz." Ceramics International 47, no. 12 (2021): 16483–90. http://dx.doi.org/10.1016/j.ceramint.2021.02.216.

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Birski, Słaby, Chatzitheodoridis, et al. "Apatite from NWA 10153 and NWA 10645—The Key to Deciphering Magmatic and Fluid Evolution History in Nakhlites." Minerals 9, no. 11 (2019): 695. http://dx.doi.org/10.3390/min9110695.

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Apatites from Martian nakhlites NWA 10153 and NWA 10645 were used to obtain insight into their crystallization environment and the subsequent postcrystallization evolution path. The research results acquired using multi-tool analyses show distinctive transformation processes that were not fully completed. The crystallization history of three apatite generations (OH-bearing, Cl-rich fluorapatite as well as OH-poor, F-rich chlorapatite and fluorapatite) were reconstructed using transmission electron microscopy and geochemical analyses. Magmatic OH-bearing, Cl-rich fluorapatite changed its primar

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Liferovich, R. P., and R. H. Mitchell. "Apatite-group minerals from nepheline syenite, Pilansberg alkaline complex, South Africa." Mineralogical Magazine 70, no. 5 (2006): 463–84. http://dx.doi.org/10.1180/0026461067050346.

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AbstractThe nepheline syenites of the Pilansberg alkaline complex (South Africa) have undergone extensive subsolidus equilibration and alteration with a deuteric Cl- and Na-rich fluid phase. Complex assemblages of secondary minerals result from the replacement of primary alummosilicates, rinkite, eudialyte and fluorapatite. The composition of apatite group minerals formed during these alteration processes reflects the Sr- and rare earth element (REE) content, Na/Cl ratio and pH of the deuteric fluids. Apatite-group minerals are observed to have formed in the following sequence: orthomagmatic f

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Shibaeva, Darya N., Alena A. Kompanchenko, Victor V. Bulatov, and Danil A. Asanovich. "Express Assessment of Apatite Content in Apatite–Nepheline Ores of Ultrabasic Alkaline Complexes Based on Its Luminescent Properties (The First Study Stage)." Minerals 13, no. 1 (2022): 37. http://dx.doi.org/10.3390/min13010037.

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The article presents the results of the first study stage aimed at analyzing the luminescent properties of the main and minor minerals composing the apatite–nepheline ores and host rocks in the deposits of the Khibiny rock massif (Kola Peninsula, Russia). The main purpose of the work was a search of a stable identification feature providing fast and safe determination of fluorapatite in the mineral mixture of apatite–nepheline ores and solving technological tasks, namely sampling the borehole walls in open pits. The first stage includes studies carried out on pure mono-fractions of four minera

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Schumann, Dirk, Robert F. Martin, Sebastian Fuchs, and Jeffrey de Fourestier. "Silicocarbonatitic melt inclusions in fluorapatite from the Yates prospect, Otter Lake, Québec: Evidence of marble anatexis in the central metasedimentary belt of the Grenville Province." Canadian Mineralogist 57, no. 5 (2019): 583–604. http://dx.doi.org/10.3749/canmin.1900015.

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Abstract We have investigated a locality very well known to mineral collectors, the Yates U-Th prospect near Otter Lake, Québec. There, dikes of orange to pink calcite enclose euhedral prisms of fluorapatite, locally aligned. Early investigators pointed out the importance of micro-inclusions in the prisms. We describe and image the micro-inclusions in two polished sections of fluorapatite prisms, one of them with a millimetric globule of orange calcite similar to that in the matrix. We interpret the globule to have been an inclusion of melt trapped during growth. Micro-globules disseminated in

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Zhao, Jun, Zhijie Chen, Haibin Zuo, Jingsong Wang, and Qingguo Xue. "Research on Reaction Mechanism of Vacuum Carbon Thermal Reduction and Dephosphorization in High Phosphate Iron Ore." Metals 8, no. 12 (2018): 1003. http://dx.doi.org/10.3390/met8121003.

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According to the mineral composition characteristics of high-phosphorus iron ore, the reaction mechanism of fluorapatite was investigated using pure substance and gangue under vacuum carbon thermal reduction (VCTR) conditions. The effects of reduction temperature, basicity, and C/O ratio on the metallization ratio, dephosphorization ratio, and phosphorus content of pellets were studied. The reaction process of fluorapatite in high-phosphorus iron ore was investigated. The results showed that when the metallization ratio of pellets reached maximum (95%), the dephosphorization ratio was only 5.6

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Priha, Outi K., Tuija H. Sarlin, Mona E. Arnold, and Päivi Kinnunen. "Enrichment and Isolation of Phosphorus Solubilizing Bacteria." Advanced Materials Research 825 (October 2013): 62–65. http://dx.doi.org/10.4028/www.scientific.net/amr.825.62.

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The aim of this study was to enrich phosphorus solubilizing microorganisms from high-phosphorus iron ores, apatite ores and phosphogypsum waste. Phosphorus solubilizing microorganisms can be utilized in dephosphorization of high-phosphorus iron ores and in phosphorus leaching from fluorapatite ores. Low grade fluorapatite ore (3.6% P, pH 6.8), fluorapatite concentrate (13% P, pH 8.3), phosphogypsum waste (0.7% P, pH 2.3), iron ore 1 (0.19% P, pH 7.6) and iron ore 2 (0.18% P, pH 7.6) were used as potential sources of phosphorus solubilizing microorganisms. The samples were cultured in NBRIP med

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Fontaine, Laurent, Nelson Thiffault, David Paré, J. André Fortin, and Yves Piché. "Phosphate-solubilizing bacteria isolated from ectomycorrhizal mycelium ofPicea glaucaare highly efficient at fluorapatite weathering." Botany 94, no. 12 (2016): 1183–93. http://dx.doi.org/10.1139/cjb-2016-0089.

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Fluorapatite-solubilizing bacteria were isolated from the hyphosphere of the ectomycorrhizal (ECM) fungus Wilcoxina sp., a dominant species in the Picea glauca (Moench) Voss rhizosphere. Hundreds of strains isolated from the ascomycete Wilcoxina sp. could dissolve tricalcium phosphate, while only 27 of them could produce clarification halos on fluorapatite-amended solid medium. Most of the fluorapatite-solubilizing strains belonged to the Burkholderia genus. Scanning electron microscopy observations have shown that these efficient phosphate-solubilizing bacteria (PSB) were able to completely s

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Furuse, Hiroaki, Daichi Kato, Koji Morita, Tohru S. Suzuki, and Byung-Nam Kim. "Characterization of Transparent Fluorapatite Ceramics Fabricated by Spark Plasma Sintering." Materials 15, no. 22 (2022): 8157. http://dx.doi.org/10.3390/ma15228157.

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Highly optically transparent polycrystalline fluorapatite ceramics with hexagonal crystal structures were fabricated via a liquid-phase synthesis of fluorapatite powder, followed by spark plasma sintering (SPS). The effect of sintering temperature, as observed using a thermopile, on the optical transmittance and microstructure of the ceramics was investigated in order to determine suitable sintering conditions. As a result, high optical transmittance was obtained in the SPS temperature range of 950–1100 °C. The highest optical transmittance was obtained for the ceramic sample sintered at 1000

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41

Regan, Sean, Marian Lupulescu, Michael Jercinovic, et al. "Age and Origin of Monazite Symplectite in an Iron Oxide-Apatite Deposit in the Adirondack Mountains, New York, USA: Implications for Tracking Fluid Conditions." Minerals 9, no. 1 (2019): 65. http://dx.doi.org/10.3390/min9010065.

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Monazite crystals, intergrown with allanite, fluorapatite, and quartz from the Cheever Mine iron oxide-apatite (IOA-type) deposit in Essex County, New York, USA, display rare symplectite textures. Electron probe wavelength-dispersive spectrometry (WDS) mapping and major and trace element characterization of these features reveal a natural experiment in fluid-mediated monazite recrystallization. Two types of monazite with symplectite intergrowths have been recognized (Type I and II). Both types of symplectite development are associated with a decrease in HREE, Si, Ca, Th, and Y, but an increase

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Sun, Yongsheng, Wentao Zhou, Yuexin Han, and Yanjun Li. "Effect of Different Additives on Reaction Characteristics of Fluorapatite During Coal-Based Reduction of Iron Ore." Metals 9, no. 9 (2019): 923. http://dx.doi.org/10.3390/met9090923.

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In the coal-based reduction of high phosphorus oolitic hematite, it is particularly important to study the mechanism of phosphorus regulation during the formation of iron metals for the efficient development and utilization of iron ore. In this study, the thermodynamics of the coal-based reduction process of fluorapatite in different mineral systems, effect mechanism of the reduction degree, kinetics, mineral composition, and morphology of structural evolution samples were systematically investigated using FactSage software, single factor analysis, the isothermal method, X-ray diffraction (XRD

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Sarlin, Tuija H., Outi K. Priha, Mona E. Arnold, and Päivi Kinnunen. "Bioleaching of Phosphorus from Low Grade Ores and Concentrates with Acidophilic Iron- and Sulphur-Oxidizing Bacteria." Advanced Materials Research 825 (October 2013): 266–69. http://dx.doi.org/10.4028/www.scientific.net/amr.825.266.

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Bioleaching experiments of phosphorus from low grade fluorapatite ore containing 8.2% P2O5 and from fluorapatite concentrate containing 29.8% P2O5 were carried out in shake flasks. Elemental sulphur was supplemented as an energy source for acid generation. Mixed and pure acidophilic bacterial cultures consisting of iron-and/or sulphur-oxidizing bacteria Acidithiobacillus ferrooxidans, A. thiooxidans and Leptospirillum ferrooxidans were used in the experiments. These acidophiles are commonly used in bioleaching of sulphide minerals, but their application on phosphorus bioleaching has been limit

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Sayenko, S. Yu. "Obtaining of strontium doped fluorapatite powders." Functional materials 22, no. 2 (2015): 263–68. http://dx.doi.org/10.15407/fm22.02.263.

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Stanic, Vojislav, Borivoj Adnadjevic, Suzana Dimitrijevic, et al. "Synthesis of fluorapatite nanopowders by a surfactant-assisted microwave method under isothermal conditions." Nuclear Technology and Radiation Protection 33, no. 2 (2018): 180–87. http://dx.doi.org/10.2298/ntrp1802180s.

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Fluorapatite nanopowders with different amounts of fluoride ions were prepared using the surfactant-assisted microwave method under isothermal conditions. Microwave irradiation was applied for the rapid formation of crystals. A micellar solution of polyoxyethylene (23) lauryl ether was used as a regulator of nucleation and crystal growth. Characterization studies from X-ray diffraction, field-emission scaning electron microscopy and Fourier-transform infrared spectra showed that crystals have an apatite structure and particles of all samples are nano size, with an average length of 50 nm and a

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Lutišanová, Gabriela, Martin Palou, Milan Mikula, and Jana Kozánková. "Characterisation of the surface structure and bioactivity of glass and glass ceramics using surface topography." Open Chemistry 10, no. 6 (2012): 1890–98. http://dx.doi.org/10.2478/s11532-012-0111-5.

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AbstractThe present paper reports the results of the relationship between the surface topography, microstructure and the in vitro bioactivity of samples with and without fluorapatite content in simulated body fluid. Glasses and glass ceramics belonging to the Li2O-SiO2-CaO-P2O5-CaF2 system were prepared by using conventional melting technique following by heat treatment to obtain glass ceramics. This current study demonstrates the benefits of combining two microscopic methods for better investigation of the surface structure. The formation of apatite layer on the surface and the increase in su

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Boink, A. B. T. J., J. Wemer, J. Meulenbelt, H. A. M. G. Vaessen, and D. J. de Wildt. "The Mechanism of Fluoride-Induced Hypocalcaemia." Human & Experimental Toxicology 13, no. 3 (1994): 149–55. http://dx.doi.org/10.1177/096032719401300302.

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1 Fluoride intoxication leads to sudden cardiac death which has been assumed to result from the accompanying severe hypocalcaemia. The aim of this study has been to investigate the suggestion that fluorapatite formation rather than CaF2 precipitation is responsible for this low calcium. 2 Measurements of free Ca2+ and F- ion concentrations in HEPES buffered solutions containing F-, Ca2+, and phosphate ions at different concentrations in the absence and presence of hydroxyapatite showed that the presence of hydroxyapatite enhanced the decrease of Ca2+ and F- concentration. 3 The ratio of Ca2+:F

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Wang, Hong You, Kang Ning Sun, Ting Shan, Xiu Qing Yang, Yan Zhao, and Yan Jie Liang. "Biomimetic Synthesis of Fluorapatite Coating." Advanced Materials Research 306-307 (August 2011): 63–71. http://dx.doi.org/10.4028/www.scientific.net/amr.306-307.63.

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In the present study, a simple method of regenerating microstructure of human tooth under near-physiological conditions (pH 7.0, 37 °C, 1 atm) was developed. Commercial gelatin was used as matrix materials in this method, which nucleated the formation of fluorapatite (FA) nanocrystals and regulated the growth of nanocrystals. As a result, the resulting thin FA coatings had been prepared on human tooth slices and sintered hydroxyapatite disks, which were in tight contact with the substrates. Besides, the morphologies of FA nanocrystals changed from acicular to hexagonal with the exchange cycle

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Leroy, N., and E. Bres. "Structure and Substitutions in Fluorapatite." European Cells and Materials 2 (November 30, 2001): 36–48. http://dx.doi.org/10.22203/ecm.v002a05.

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OISHI, Shuji, and Teruyuki KAMIYA. "Flux Growth of Fluorapatite Crystals." NIPPON KAGAKU KAISHI, no. 9 (1994): 800–804. http://dx.doi.org/10.1246/nikkashi.1994.800.

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