Abstract

The present communication is focused on inclusions in topaz from the Mokrusha pegmatite deposit, Urals. These inclusions are intergrown fine crystals of manganocolumbite, cassiterite and a mineral compositionally corresponding to niobium tungstate with minor Mn, Ta, and Fe. Electron microprobe and X-ray diffraction study has revealed that this mineral is identical to that previously described by A. V. Voloshin et al. (1997) in granite pegmatites of the Southwestern Pamir Mountains, Tajikistan. The crystal chemical formula of the mineral is (Mn_2.02F_0.98)_Σ3.00(Nb_2.296Ta_0.640Ti_0.062)_Σ3.00(Nb_1.04Mn_0.960)_Σ2.00(W_1.343Nb_0.664)_Σ2.00O₂0.

中文翻译：

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俄罗斯乌拉尔Mokrusha矿伟晶岩中黄玉中的Koragoite包裹体

摘要

本次交流的重点是来自乌拉尔Mokrusha伟晶岩矿床的黄玉中的夹杂物。这些夹杂物是锰锰矿，锡石和矿物组成与钨酸铌，锰，钽和铁含量较低的矿物共生的细晶体。电子探针和X射线衍射研究表明，这种矿物与AV Voloshin等人先前描述的矿物相同。（1997年）在塔吉克斯坦西南帕米尔山的花岗岩伟晶岩中。矿物的晶体化学式为（Mn _2.02 F _0.98）_Σ3.00（Nb _2.296 Ta _0.640 Ti _0.062）_Σ3.00（Nb _1.04 Mn _0.960）_Σ2.00（W _1.343铌_0.66 4）_Σ2.00 Ø ₂ 0。