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Structures, Compositions, and X-Ray Diffraction Identification of Dioctahedral Chlorites

Published online by Cambridge University Press:  02 April 2024

S. W. Bailey  and
Judith S. Lister
S. W. Bailey
Affiliation:
Department of Geology & Geophysics, University of Wisconsin, Madison, Wisconsin 53706
Judith S. Lister
Affiliation:
Department of Geology & Geophysics, University of Wisconsin, Madison, Wisconsin 53706
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Abstract

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Al-rich di, trioctahedral chlorite exists as the species cookeite and sudoite. Di,dioctahedral chlorite exists as the species donbassite. Cookeite has essential Li in its structure, sudoite has essential Mg, and donbassite has only small amounts of either element. To date, sudoite has been reported to have only IIb structural units and donbassite to have only Ia structural units. Cookeite is based primarily on Ia structural units, but IIb units are present in specimens from two localities. Most Al-rich chlorite species have regular-stacking “r” or “s” 2-layer stacking sequences, but 1-layer Ia-2 and Ia-6 polytypes also are known. The structural units (Ia or IIb) and the specific stacking sequences can be explained by a combination of local charge balance and minimization of cation-cation repulsion involving the interlayer and tetrahedral cations. X-ray powder diffraction data are adequate to differentiate Al-rich chlorite from trioctahedral chlorite and to identify the type of structural unit present, but single crystal study is necessary to identify the 2-layer and 1-layer sequences with certainty.

Keywords

Chemical compositionChloriteCookeiteCrystal structureDonbassiteSudoiteX-ray powder diffraction
Type
Research Article
Information
Clays and Clay Minerals , Volume 37 , Issue 3 , June 1989 , pp. 193 - 202
Copyright
Copyright © 1989, The Clay Minerals Society

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