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The Geology of Vermiculite Occurrences

Published online by Cambridge University Press:  01 January 2024

William A. Bassett
William A. Bassett*
Affiliation:
The University of Rochester, Rochester, New York, USA
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Abstract

Vermiculite occurrences can be divided into two major categories, those having macro-scopic and those having microscopic or clay vermiculite. This paper is concerned with the former. The macroscopic type of vermiculite deposits can be subdivided into four categories based on the host rock: (1) ultramafic and mafic; (2) gneiss and schist; (3) carbonate rocks; and (4) granitic rocks. Field and laboratory evidence strongly suggests that most and possibly all macroscopic-type vermiculite deposits formed by the action of supergene solutions on biotite and phlogopite. Vermiculite in mixed-layer association with biotite, phlogopite, and chlorite is likewise believed to be of supergene origin.

Type
Symposium on Occurrence and Origin of Vermiculite
Information
Clays and Clay Minerals (National Conference on Clays and Clay Minerals) , Volume 10 , February 1961 , pp. 61 - 69
Copyright
Copyright © Clay Minerals Society 1961

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