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Ganterite, the barium mica Ba0.5K0.5Al2(Al1.5Si2.5)O10(OH)2, from Oreana, Nevada
-
Chi Ma
and
George R. Rossman
Published/Copyright:
March 31, 2015
Abstract
The barium dioctahedral layer silicate, ganterite, was identified from the Lincoln Hill dumortierite deposit near Oreana, Nevada, based on electron microprobe, electron-backscatter diffraction (EBSD), and Raman spectrum microanalyses. This phase occurs with dumortierite, barite, and muscovite in a vein specimen formed by hydrothermal alteration. Back-scattered electron images of the muscovite from this locality show extensive zonation of the BaO content with regions of high Ba concentrations up to 15 µm in dimension. Electron microprobe analyses of these regions reveal a composition (Ba0.53 K0.37Na0.05)Σ=0.95 (Al2.00Ti0.01)Σ = 2.01 [Al1.51Si2.49O10](OH)2 or, ideally, (Ba0.5K0.5)Al2(Al1.5Si2.5)O10(OH)2. This composition corresponds to the recently described mica, ganterite. Complete solid solutions between muscovite and ganterite were observed that range from 0.60% up to 18.12 wt% BaO. The electronbackscatter diffraction and Raman spectra of this phase are essentially indistinguishable from those of muscovite confirming that ganterite has a mica structure.
Received: 2005-8-30
Accepted: 2005-10-22
Published Online: 2015-3-31
Published in Print: 2006-4-1
© 2015 by Walter de Gruyter Berlin/Boston
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- Cation redistribution in the octahedral sheet during diagenesis of illite-smectites from Jurassic and Cambrian oil source rock shales
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