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Authigenic Kaolinite and Mica as Evidence for Phase Equilibria at Low Temperatures

Published online by Cambridge University Press:  01 January 2024

R. W. Rex
R. W. Rex*
Affiliation:
California Research Corporation, California, USA
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Abstract

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Electron micrograph, X-ray diffraction, and chemical studies of secondary clay minerals formed within sandstones provide data supporting a portion of the phase relationships proposed by Garrels (Garrels and Christ, 1965) for kaolinite and K-mica growing in equilibrium with K-feldspar and quartz at about 25°C. A true phase distinction between mica and kaolinite is found at the phase boundary and not a continuous solid-solution series, such as proposed by Keeling (1961). Some of the micas, however, show evidence for the presence of an interlayer impurity, such as small amounts of hydroxymagnesium cation proxying for K+. Electron micrographs and diffraction studies show epitaxial growth of oriented mica crystals on kaolinite providing evidence for the existence of these two distinct phases in mutual equilibrium with the solution from which they crystallized.

Type
Symposium on Structural Aspects of Layer Silicate
Information
Clays and Clay Minerals (National Conference on Clays and Clay Minerals) , Volume 13 , February 1964 , pp. 95 - 104
Copyright
Copyright © The Clay Minerals Society 1964

Footnotes

*

Box 446, La Habra, California.

References

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