Stibiomicrolite from granitic pegmatite in the Dzhabyk-Karagai pluton of the South Urals |
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| Authors: | V I Popova E I Churin |
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| Institution: | 1. Institute of Mineralogy, Ural Branch, Russian Academy of Sciences, Miass, Chelyabinsk oblast, 456317, Russia
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| Abstract: | Stibiomicrolite has been identified in the Lepidolite Vein (53°06.8′N, 60°15.4′E) as metasomatic veinlets with tantite replacing stibiotantalite along fractures. The mineral is light gray-yellow, isotropic, and with reflectance of ～12%. The average chemical composition of two stibiomicrolite samples is as follows, wt %: Sb2O3 23.34, CaO 4.91, Na2O 0.96, MnO 0.17, Ta2O5 58.97, Nb2O5 6.64, total 94.99; H2Ocalc 3.4. The empirical formula is (Sb1.02Ca0.55Na0.20Mn0.02)1.79(Ta1.68Nb0.32)2.0O6(OH)1.18. Trilithionite, polylithionite, albite, manganotantalite, beryl (goshenite), elbaite, stibiotantalite, and tantite are associated with stibiomicrolite in the central zone of the Lepidolite Vein. |
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