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Regularly Interstratified Montmorillonite-Chlorite in Basalt

Published online by Cambridge University Press:  01 January 2024

J. W. Earley  and
I. H. Milne
J. W. Earley
Affiliation:
Gulf Research & Development Company, Pittsburgh, Pennsylvania, USA
I. H. Milne
Affiliation:
Gulf Research & Development Company, Pittsburgh, Pennsylvania, USA
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Abstract

The dominant clay mineral in an amygdaloidal basalt from Mozambique is a mixed-layer variety having a highly regular alternation of montmorillonite-like and chlorite-like layers. The montmorillonite-chlorite occurs in the amygdules as green rosettes having a fine fibrous structure.

X-ray examination of this mineral shows a long spacing of about 29 A in air and a fairly well-developed sequence of basal spacings. The long spacing shows some variation which is dependent on the relative humidity of the air surrounding the sample. The montmorillonite-like layers expand with glycerol and contract with heat treatment similar to montmorillonite, while the chiorite-like layers show modified reflection intensities on heating similar to chlorite. The mineral shows a 31.7 A spacing when glycerol saturated and a 23.3 A spacing when fully dehydrated.

Type
Article
Information
Clays and Clay Minerals (National Conference on Clays and Clay Minerals) , Volume 4 , February 1955 , pp. 381 - 384
Copyright
Copyright © The Clay Minerals Society 1955

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Footnotes

Publication authorized by Executive Vice-President, Gulf Research & Development Company.

References

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