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A re-examination of the structure of ganophyllite

Published online by Cambridge University Press:  05 July 2018

Richard A. Eggleton  and
Stephen Guggenheim
Richard A. Eggleton
Affiliation:
Geology Department, Australian National University Canberra, A.C.T., Australia Department of Geological Sciences, University of Illinois at Chicago, Chicago, Illinois 60680, USA
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Abstract

The superstructure of ganophyllite has been analysed using subcell single crystal X-ray data and electron-optical observations. The full cell (supercell), space group A2/a, a = 16.6, b = 26.6, c = 50 Å, β = 94° has the approximate formula (K,Na,Ca)6+7.5(Mg,Fe,Mn)24[Si32.5Al7.5]O96(OH)1621H2O, Z = 8. A structure is proposed in which triple chains of silica tetrahedra parallel to X form narrow 2 : 1 layers with sinusoidal Mn-octahedral sheets. The triple chains are connected laterally, and across the interlayer, by pairs of inverted tetrahedra, linking to each other into four-member rings parallel to (010). Polytypes are generated by various displacements of the inverted tetrahedra.

Keywords

ganophyttitecrystal structuresuperstructure
Type
Crystal Structures
Information
Mineralogical Magazine , Volume 50 , Issue 356 , June 1986 , pp. 307 - 315
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1986

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