 | | Journal (article/letter/editorial) | | steel making and industrial modernisation in China, Russia and India as the cause of price spikes in the Ta...considered for potential coproduction of Ta and Nb. Pyrochlore (Nb–Ta), columbitetantalite (Nb–Ta), wodginite...Economically, significant deposits of Ta and Nb contain pyrochlore, columbite-tantalite, fersmite, loparite and...Tantalum . Rare-elements . Strategic metals . Pyrochlore . Columbite . Tantalite Introduction Tantalum...(Ta) and niobium (Nb) are transition metals in group 5 of the periodic table, have nearly identical atomic |  | | Journal (article/letter/editorial) | | MINERAL PARAGENESES Compositional Variations of Pyrochlore Group Minerals in Ongonite and Zwitter of the Verkhneurmiysky...Petersburg Mining University, Saint Petersburg, 199106, Russia *e-mail: alekseev_vi@pers.spmi.ru Received June...2017; accepted August 15, 2017 Abstract—The pyrochlore-group minerals in ongonite and zwitter of the Verkhneurmiysky...Verkhneurmiysky granite pluton in the Badzhal district, Russian Far East are reported. The composition...rare species of pyrochlore, pyrochlore-I and pyrochlore-II in ongonite, and pyrochlore-III in zwitter |  | | Journal (article/letter/editorial) | | Museum, Russian Academy of Sciences, Moscow, 125009 Russia *e-mail: a.tkachev@sgm.ru Received December 21...Xianghualing; (58) Dajishan; (59) Yichun; (60) Orlovka; (61) Etyka; (62) Baihuanao; (63) Kougarok; (64)...Zavitinskoe Parun Taghawlor Xianghualing Dajishan Yichun Orlovka Etyka Baihuanao Kougarok Toongi Baerzhe P P P...of lithium, another element from the rare-metal group, which is in high commercial demand (Tkachev et...which the ores accumulate almost all tantalum in pyrochlore (Arkhangel’skaya et al., 2012). The Nechalacho |  | Graupner, T., Melcher, F., Gäbler, H.-E., Sitnikova, M., Brätz, H., Bahr, A. (2010) Rare earth element geochemistry of columbite-group minerals: LA-ICP-MS data. Mineralogical Magazine, 74 (4) 691-713 doi:10.1180/minmag.2010.074.4.691 | Journal (article/letter/editorial) | | 691–713 Rare earth element geochemistry of columbite-group minerals: LA-ICP-MS data T. GRAUPNER1,*, F. MELCHER1...distribution patterns are defined for columbite-group minerals (CGM) from lithiumcaesium-tantalum (LCT)...Ta(Nb) minerals (e.g. columbite-group minerals (CGM), pyrochlore-group minerals) have been studied in...(2A2++B5+ ? 3(Ln+Fe)3+) substitution mechanism. In pyrochlore-group minerals with the general formula A2 mB2X6Y1...Černý (1990)). Weatheringrelated alteration of pyrochlore-group minerals results in a leaching of the REEs |  | | Journal (article/letter/editorial) | | minerals are oxides. The columbite-tantalite and pyrochlore-microlite groups are the most common Ta- and...The economically important minerals are oxides. Pyrochlore is the main ore mineral for Nb and tantalite...composition of two end members of the pyrochlore group is pyrochlore [(Na,Ca)2 Nb2 O6 (OH,F)] and microlite...Nb)O3 ]), which is a mineral of the perovskite group and tapiolite (Fe, Mn)(Ta, Nb)2 O6 have a limited...of Nb and Ta mineralization as it lies between Russia and China, which both have in neighbouring parts |  | | Journal (article/letter/editorial) | | widely studied (C has been recognized that columbite-group minerals generally evolve from ferrocolumbite to...Australia (Partington and McNaughton, 1995), Orlovka from Russia (Reyf et al., 2000), and Beauvoir granite...late-magmatic crystallization of the columbite group minerals from evolved silicate melt over hydrothermal...found in mineralized granite stocks (Beauvoir, Orlovka, and Podlesı́). In spite of that, regular dissemination...(1977) Classification and nomenclature of the pyrochlore group. Am Mineral 62: 403–410 Horng W-S, Hess PC |  | | Journal (issue) | | concentration in rare-element granites and pegmatites from Russia………………………………………………………………..4 BARROS, R., MENUGE...crystal chemistry and classification of samarskite group minerals………………………………………………………………………………………………………………………………...the South Sangilen pegmatite belt, Tyva Republic, Russia…………………………………………………………………………………..68 LIMA, A., DIAS...Mineralogy and geochemistry of the Rau pegmatite group, Yukon Territory, Canada………..126 SIMMONS, W.B....al. (2009). also found in the ca. 1500 Ma Rjukan Group metarhyolites. The 86 87 presence of coeval granites |  | Redkin, A. F., Velichkin, V. I., Aleshin, A. P., Borodulin, G. P. (2009) Interaction of model F-bearing silicic melt with chloride fluid, uraninite, and columbite at 750°C and 1000–2000 bar and its implications for estimation of the ore-forming capability of the upper crustal magma chamber beneath the Strel’tsovka caldera, eastern Transbaikalia. Geology of Ore Deposits, 51 (4) 290-304 doi:10.1134/s1075701509040035 | Journal (article/letter/editorial) | | Institutskaya ul. 4, Chernogolovka, Moscow oblast, 142432 Russia b Institute of Geology of Ore Deposits, Petrography...Sciences, Staromonetnyi per. 35, Moscow, 119017 Russia Received February 20, 2008 Abstract—The experimental...et al., 2004, 2006). The Ta–Nb deposits (Etyka, Orlovka), the Spokoiny W deposit, and other rare-metal... a part of uranium entered into newly formed pyrochlore. Columbite. The initial natural columbite is...in aluminosilicate melt and was converted into pyrochlore (Lumpkin and Ewing, 1995). In the products of |  | Ballouard, Christophe, Elburg, Marlina A., Tappe, Sebastian, Reinke, Christian, Ueckermann, Henriette, Doggart, Shane (2020) Magmatic-hydrothermal evolution of rare metal pegmatites from the Mesoproterozoic Orange River pegmatite belt (Namaqualand, South Africa) Ore Geology Reviews, 116. 103252 doi:10.1016/j.oregeorev.2019.103252 | Journal (article/letter/editorial) | | rare metal contents of muscovite and columbite group minerals (CGM) increase from the weakly mineralized...crystallization of lepidolite and zero-valence-dominant pyrochlore as well as strong localized greisenization and...comprises volcano-sedimentary rocks (the Orange River Group) and intrusions (i.e. the Vioolsdrif Suite) formed...gadolinite, euxenite, columbite group minerals (CGM) and pyrochlore in addition to the mineral assemblage...chemical composition of columbite group minerals (CGM), pyrochlore group minerals (PGM) and rutile are provided |  | Dill, Harald G., Weber, Berthold, Melcher, Frank, Wiesner, Werner, Müller, Axel (2014) Titaniferous heavy mineral aggregates as a tool in exploration for pegmatitic and aplitic rare-metal deposits (SE Germany) Ore Geology Reviews, 57. 29-52 doi:10.1016/j.oregeorev.2013.08.023 | Journal (article/letter/editorial) | | contain inclusions of, e.g., columbite-(Fe), pyrochlore group minerals, wolframite solid solution series...311 Ma. It is the most proximal member of this group of HM aggregates. Type C “nigrine” is enriched in...less resistant minerals such as columbite and pyrochlore. When these titaniferous HM aggregates got decomposed...weathering of single crystals of columbite- and pyrochlore group minerals. “Antinigrine” and “nigrine” may...enriched in Li and Sc, as well as columbite- and pyrochlore group minerals (Dill et al., 2007a,b, 2008b, 2011 |  | | Journal (article/letter/editorial) | | monazite-(Nd), fersmite, ferrocolumbite, REE,Y-rich pyrochlore are strongly altered. Geochemical and mineralogical...(0.05 apfu; 3.19 wt. % WO3). Minerals from pyrochlore group were also found but their structural type...for vacancies in the A-site. Also a REE-Y-rich pyrochlore mineral characterized by high contents of Si...observed in the George Ashley Block, Pala Pegmatite District, Southern California (Webber et al. 1997). However...Little Three layered pegmatite–aplite dike, Ramona District, California. Contrib Mineral Petrol 136: 310–330 |  | | Journal (article/letter/editorial) | | geochronology and geochemistry of granitoids in the Douling Group in the eastern Qinling—Zhang Chengli, Li Miao, Wang...hosted high-grade hematite deposits, a coherent group?—H. Dalstra, T. Harding, T. Riggs, and D. Taylor...host rocks of the Orlovka–Spokoinoe mining district, eastern Transbaikalia (Russia)—A. Dolgopolova, R...from the Berezovskoe gold deposit, Middle Urals, Russia—Ivan A. Baksheev and Olesya E. Kudryavtseva Gold...in metabasic rocks at the Mouska mine, Bousquet district, Abitibi, Quebec, Canada —Abdelhay Belkabir, Claude |  | McNeil, Alysha G., Linnen, Robert L., Flemming, Roberta L. (2020) Solubility of wodginite, titanowodginite, microlite, pyrochlore, columbite-(Mn) and tantalite-(Mn) in flux-rich haplogranitic melts between 700° and 850 °C and 200 MPa. Lithos, 352. 105239 doi:10.1016/j.lithos.2019.105239 | Journal (article/letter/editorial) | | Solubility of wodginite, titanowodginite, microlite, pyrochlore, columbite-(Mn) and tantalite-(Mn) in flux-rich...Solubility of wodginite, titanowodginite, microlite, pyrochlore, columbite-(Mn) and tantalite-(Mn) in flux-rich...tantalite, wodginite, titanowodginite, microlite and pyrochlore. Solubility and crystallization mechanisms for...of wodginite, titanowodginite, microlite and pyrochlore are compared to those for columbite-(Mn) and...followed by columbite-(Mn) (-2.68 mol2/kg2), and pyrochlore (-3.71 mol3/kg3) titanowodginite (-3.73 mol3/kg3) |  | | Journal (article/letter/editorial) | | species of the tantalite series and is one of a group of minerals known commercially as coltan (the columbite–tantalite...quartzites of the Equador Formation in the Seridó Group. The tantalite-(Mn) crystals studied—up to 5-cm... The identification to the columbite–tantalite group minerals in the spodumene and of zabuyelite and...GPa: implications for the crystallization of pyrochlore-group minerals in carbonatites. Can Mineral 46:981–990...beryl from pegmatite in the Orlovka amazonite granite, East Transbaikalia, Russia: implications for pegmatite-forming |  | Akinfiev, Nikolay N., Korzhinskaya, Valentina S., Kotova, Natalia P., Redkin, Alexander F., Zotov, Alexander V. (2020) Niobium and tantalum in hydrothermal fluids: Thermodynamic description of hydroxide and hydroxofluoride complexes. Geochimica et Cosmochimica Acta, 280. 102-115 doi:10.1016/j.gca.2020.04.009 | Journal (article/letter/editorial) | | Sciences, Staromonetny per. 35, Moscow 119017 Russia 8 b 9 Russia Institute of Geology of Ore Deposits,... 10 c 11 4, Chernogolovka, Moscow district, 142432 Russia 12 Abstract 13 Available experimental...solubility of niobates and 63 tantalites and the pyrochlore group of minerals in the fitting procedures because...field strength elements” (HFSE). Both 77 are group-Vb elements, have similar electronic configurations...the Ta– 446 Nb-bearing Li–F granite system at Orlovka and Etyka ore deposits was about 1 molkgH2O–1 |  | Melcher, Frank, Graupner, Torsten, Gäbler, Hans-Eike, Sitnikova, Maria, Henjes-Kunst, Friedhelm, Oberthür, Thomas, Gerdes, Axel, Dewaele, Stijn (2015) Tantalum–(niobium–tin) mineralisation in African pegmatites and rare metal granites: Constraints from Ta–Nb oxide mineralogy, geochemistry and U–Pb geochronology. Ore Geology Reviews, 64. 667-719 doi:10.1016/j.oregeorev.2013.09.003 | Journal (article/letter/editorial) | | 3 ACCEPTED MANUSCRIPT Melcher et al. 6.1. Pyrochlore-supergroup minerals 6.2. Bismutotantalite [Bi(Nb...granitic rare-element IP pegmatites. Columbite-group minerals (CGM) account for the majority of the current...tapiolite, wodginite, ixiolite, rutile SC R and pyrochlore-supergroup minerals may also be used. In this...rare-element pegmatites (Černý et al., 2005). Columbite-group minerals (columbite-tantalite solid solution series;...members of the orthorhombic columbite-tantalite group (CGM) with the general formula AB2O6 (A = Fe2+, |  | Guzmics, Tibor, Mitchell, Roger H., Szabó, Csaba, Berkesi, Márta, Milke, Ralf, Abart, Rainer (2011) Carbonatite melt inclusions in coexisting magnetite, apatite and monticellite in Kerimasi calciocarbonatite, Tanzania: melt evolution and petrogenesis. Contributions to Mineralogy and Petrology, 161 (2) 177-196 doi:10.1007/s00410-010-0525-z | Journal (article/letter/editorial) | | beryl from pegmatite in the Orlovka amazonite granite, East Transbaikalia, Russia: implications for pegmatiteforming...(2004) Extreme compositional variation of pyrochlore-group minerals at the Oka carbonatite complex, Quebec: |  | | Journal (volume) | | (Czech Republic) (Romania/USA) (Germany) (Hungary) (Russia) (Czech Republic) (Japan) (Germany) Publication................................245 EG52 Platinum-group minerals in the new millennium....................[1]. Chromium-rich spinels MCr2O4 are part of a group of exciting and challenging materials that have...Inst. of Silicate Chemistry RAS, St. Petersburg, Russia (*rimma_bubnova@mail.ru) 2 Dept. of Crystallography...St. Petersburg State University, St. Petersburg, Russia 1 Nowadays borates are well known as advanced |
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