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A potassium-rich beidellite from a laterite pallid zone in Western Australia

Published online by Cambridge University Press:  09 July 2018

Balwant Singh  and
R. J. Gilkes
Balwant Singh
Affiliation:
Soil Science and Plant Nutrition, The University of Western Australia, Nedlands, WA 6009, Australia
R. J. Gilkes
Affiliation:
Soil Science and Plant Nutrition, The University of Western Australia, Nedlands, WA 6009, Australia
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Abstract

A smectite formed by weathering of mica in a laterite pallid zone at Boddington, Western Australia has been investigated by analytical electron microscopy. The evidence suggests that this mineral has the chemical composition and swelling properties of ideal beidellite but is anomalous in containing abundant non-exchangeable K. This K balances half of the layer charge that arises mostly from tetrahedral substitution of Al3+ for Si4+, with the K+ occupying one sixth of the sites occupied by K in mica.

Type
Research Article
Information
Clay Minerals , Volume 26 , Issue 2 , June 1991 , pp. 233 - 244
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1991

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