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Weathering of a Chromian Muscovite to Kaolinite

Published online by Cambridge University Press:  02 April 2024

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

Single crystal X-ray diffraction and electron-optical analysis were used to investigate the weathering of a chromium-bearing muscovite (fuchsite). The muscovite had mostly altered to kaolinite with minor amounts of halloysite occurring between kaolinite plates. Evidence for both epitactic and topotactic growth of kaolinite from muscovite was obtained and no intermediate poorly-crystalline phases were detected. About half of the Cr in fuchsite was incorporated into kaolinite, whereas most of the Ti, Fe and Mg was lost.

Keywords

AlterationChromian muscoviteKaoliniteTopotaxyWeathering
Type
Research Article
Information
Clays and Clay Minerals , Volume 39 , Issue 6 , December 1991 , pp. 571 - 579
Copyright
© Clay Minerals Society 1961

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