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Chromium-rich vanadio-oxy-dravite from the Tzarevskoye uranium-vanadium deposit, Karelia, Russia: a second world-occurrence of Al-Cr-V-oxy-tourmaline
Mineralogical Magazine ( IF 2.7 ) Pub Date : 2020-10-23 , DOI: 10.1180/mgm.2020.77
Ferdinando Bosi , Alessandra Altieri , Fernando Cámara , Marco E. Ciriotti

Abstract A green tourmaline sample from the Tzarevskoye uranium–vanadium deposit, close to the Srednyaya Padma deposit, Lake Onega, Karelia Republic, Russia, has been found to be the second world-occurrence of Cr-rich vanadio-oxy-dravite in addition to the Pereval marble quarry, Sludyanka crystalline complex, Lake Baikal, Russia, type-locality. From the crystal-structure refinement and chemical analysis, the following empirical formula is proposed: X(Na0.96K0.02□0.02)Σ1.00 Y(V1.34Al0.68Mg0.93Cu2+0.02Zn0.01Ti0.01)Σ3.00 Z(Al3.19Cr1.36V0.03Mg1.42)Σ6.00(TSi6O18)(BBO3)3V(OH)3W[O0.60(OH)0.23F0.17]Σ1.00. Together with the data from the literature, a compositional overview of Al–V–Cr–Fe3+-tourmalines is provided by using [6]Al–V–Cr–Fe3+ diagrams for tourmaline classification. These diagrams further simplify the tourmaline nomenclature as they merge the chemical information over the octahedrally-coordinated sites (Y and Z) by removing the issues of uncertainty associated with cation order–disorder across Y and Z. Results show the direct identification of tourmalines by using the chemical data alone.

中文翻译:

来自俄罗斯卡累利阿 Tzarevskoye 铀钒矿床的富含铬的钒氧辉石:Al-Cr-V-氧-电气石的第二次世界发现

摘要 来自俄罗斯卡累利阿共和国奥涅加湖 Srednyaya Padma 矿床附近的 Tzarevskoye 铀钒矿床的绿色电气石样品被发现是世界上第二个富含 Cr 的钒氧辉石Pereval 大理石采石场,Sludyanka 结晶复合体,俄罗斯贝加尔湖,类型产地。从晶体结构细化和化学分析,提出以下经验公式: X(Na0.96K0.02□0.02)Σ1.00 Y(V1.34Al0.68Mg0.93Cu2+0.02Zn0.01Ti0.01)Σ3.00 Z(Al3.19Cr1.36V0.03Mg1.42)Σ6.00(TSi6O18)(BBO3)3V(OH)3W[O0.60(OH)0.23F0.17]Σ1.00。结合文献中的数据,通过使用 [6]Al-V-Cr-Fe3+ 图进行电气石分类,提供了 Al-V-Cr-Fe3+-电气石的成分概览。
更新日期:2020-10-23
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