 | | Journal (article/letter/editorial) | | Museum, Russian Academy of Sciences, Moscow, 125009 Russia *e-mail: a.tkachev@sgm.ru Received December 21...(58) Dajishan; (59) Yichun; (60) Orlovka; (61) Etyka; (62) Baihuanao; (63) Kougarok; (64) Toongi; (65)...Taghawlor Xianghualing Dajishan Yichun Orlovka Etyka Baihuanao Kougarok Toongi Baerzhe P P P G G G G...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 |  | | 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 |  | Vasil’ev, N. V., Chevychelov, V. Yu., Zaraisky, G. P., Borodulin, G. P., Udoratina, O. V. (2009) Tantalum-niobium mineralization of the Taikeu ore cluster, the Polar Urals. Geology of Ore Deposits, 51 (7) 537-548 doi:10.1134/s1075701509070034 | Journal (article/letter/editorial) | | Institutskaya 4, Chernogolovka, Moscow oblast, 142432 Russia; bInstitute of Geology, Komi Scientific Center...Sciences, ul. Pervomaiskaya 54, Syktyvkar, 167982 Russia Received January 29, 2008 Abstract—The Taikeu...major ore minerals belong to the fergusonite and pyrochlore groups (mainly plumbopyrochlore). The compositional...albitization. The chemical composition of the pyrochlore-group minerals evolves as follows: Na+Ca U+Th Pb...cluster is a part of the Kharbei–Longotyugan ore district and comprises four Ta–Nb deposits: Taikeu, Ust-Mramorny |  | | 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 |  | 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...Badanina 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 |  | 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...quartz- 433 amazonite-mica pegmatoid located in the Etyka Ta deposit (Eastern Transbaikalia). Its 434 composition |  | | 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 |  | | Book (volume) | | Eastern Transbaikalia Belaya Gora, Lower Khabarovsk Krai Berezovo, Eastern Blagodatnensk, Bodaibo Amur...Chorukh-Dairon, Obl. Tadzhikistan Eastern Asia Karamken, Krai Khabarovsk ca 4040/7030 6020/15100 Kavalerovo...Khakandzha, Khabarovsk 6108/14143 Krai Khingan, Khabarovsk 4810/13050 Krai Khabarovsk 6119/14911 4025/6942...4025/6942 4810/13050 Krai Buryat Kitelya, Northern region Kiyalykh-Uzen', 5030/10320 ASSR Ladoga...Eastern 5847/5923 Kochkar, Derbeke-Nel'gekha, Etyka, Urals 5140/11400 Transbaikalia Buryat Middle |  | | 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 |  | | 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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