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Lowering of symmetry in pyribole structures

Published online by Cambridge University Press:  05 July 2018

J. E. Chisholm
J. E. Chisholm*
Affiliation:
Mineralogy Department, British Museum (Natural History), Cromwell Road, London SW7 5BD
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Abstract

The low-symmetry forms of the clinopyroxene structure fit the rules proposed previously (Chisholm, 1981) but the low-symmetry forms of ortho- and proto-pyroxene do not. The rule governing the packing of the tetrahedral chains into layers is therefore revised to take into account the different chain configurations. Starting with simple sequences of. and × chains (Thompson, Hallimond Lecture 1979, unpubl.) a scheme is proposed for deriving most of the known pyribole structure types and their space groups.

Type
Research Article
Information
Mineralogical Magazine , Volume 45 , Issue 337 , 1982 , pp. 25 - 34
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1982

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