Abstract

It has been shown by Coombs (1960) and Levinson and Vian (1966) that montmorillonite group minerals can be formed hydrothermally in the laboratory, at temperatures and pressures as low as 175°C and 130 psi, from a suitable mixture of kaolinite, quartz and a carbonate. Much higher rates of reaction are obtained if dolomite is the carbonate. The note describes an occurrence in which this reaction is probably proceeding in nature.

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