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Crystallochemical classifications of phyllosilicates based on the unified system of projection of chemical composition: II. The chlorite group

Published online by Cambridge University Press:  09 July 2018

A. Wiewióra  and
Z. Weiss
A. Wiewióra
Affiliation:
Institute of Geological Sciences, Polish Academy of Sciences, Al. Zwirki i Wigury 93, 02-089 Warsaw, Poland
Z. Weiss
Affiliation:
Research Coal Institute, 716-07 Ostrava-Radvanice, Czechoslovakia
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Abstract

The classification and nomenclature of chlorites have been critically reviewed. A new classification based on the unified projection system of chemical composition has been proposed in which for the first time all trioctahedral, di-trioctahedral and dioctahedral species are included. The chemical composition of chlorites is controlled by the general crystallo-chemical formula: This is superior to the known formulae for the trioctahedral and dioctahedral chlorites. It has been shown that the chlorite end-member compositions of Bayliss (1975) project in one point of the projection field leaving many end-member compositions unnamed. As they correspond to the names used previously, a proposal is made to restore these names.

Type
Research Article
Information
Clay Minerals , Volume 25 , Issue 1 , March 1990 , pp. 83 - 92
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1990

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