Stacking variations and nonstoichiometry in the bixbyite-braunite polysomatic mineral group

J. P. De Villiers, P R Buseck

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11 Scopus citations

Abstract

Bixbyite, braunite, neltnerite, and braunite-II are members of a mineral group based on the cation arrangement of the fluorite structure type, with general formula M8O12 (M = Mn, Fe, Ca, Si). They consist of layer modules of (Mn,Fe)-O octahedra stacked in various sequences that depend on the coordination of interlayered M cations. The structures of 21 possible layer assemblages have been generated using stacking vectors derived from the known mineral varieties. These structures have been used to simulate the images obtained by electron microscopy. -from Authors

Original languageEnglish (US)
Pages (from-to)1325-1336
Number of pages12
JournalAmerican Mineralogist
Volume74
Issue number11-12
StatePublished - Jan 1 1989

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ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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