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Polytype Diversity of the Hydrotalcite-Like Minerals II. Determination of the Polytypes of Experimentally Studied Varieties

Published online by Cambridge University Press:  28 February 2024

A. S. Bookin ,
V. I. Cherkashin  and
V. A. Drits
A. S. Bookin
Affiliation:
Geological Institute of the Russian Academy of Sciences, 109017 Moscow, Phyzevsky 7 Russia
V. I. Cherkashin
Affiliation:
Geological Institute of the Russian Academy of Sciences, 109017 Moscow, Phyzevsky 7 Russia
V. A. Drits
Affiliation:
Geological Institute of the Russian Academy of Sciences, 109017 Moscow, Phyzevsky 7 Russia
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Abstract

Polytype diversity of hydrotalcite-like minerals is mainly a function of the nature of the interlayer anion. Among the varieties with CO32− anions, only two- and three-layer polylypes having the same structure as manasseite and hydrotalcite have been confirmed. Stichtite and reevesite, which have been previously identified as six-layer polytypes, are in fact three-layer polytypes.

Among SO42− varieties, one-layer and three-layer polytypes have been identified, but the one-layer types are only present in more hydrated minerals with larger interlayer spacings. The three-layer varieties are of three different polytypes, with both P- and O-types of interlayers. Both rhombohedral and hexagonal varieties exist. Interlayer type may change during hydration-dehydration or anion exchange. Thus, in contrast with the CO32−-bearing minerals, a complete description of the polytype of the SO42−-bearing minerals cannot be made by simply indicating the number of the brucite-like layers in the unit cell.

The two-layer unit cell seen in refined crystal structures of some minerals with SO42− interlayers is not due to a doubled periodicity of alternation of brucite-like layers but to periodicity of interlayer anions, or layer cations.

Keywords

Hydrotalcite-like groupPolytypeX-ray diffraction criteria
Type
Research Article
Information
Clays and Clay Minerals , Volume 41 , Issue 5 , October 1993 , pp. 558 - 564
Copyright
Copyright © 1993, The Clay Minerals Society

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