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Montmorillonite Pseudomorphs after Amphibole from Melbourne, Australia

Published online by Cambridge University Press:  01 July 2024

W. F. Cole  and
C. J. Lancucki
W. F. Cole
Affiliation:
Commonwealth Scientific and Industrial Research Organization, Melbourne, Australia
C. J. Lancucki
Affiliation:
Commonwealth Scientific and Industrial Research Organization, Melbourne, Australia
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Abstract

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Well developed smectite “crystals” up to 10 mm long, which probably are pseudomorphic after titaniferous hornblende phenocrysts, are present in a weathered dike in a Melbourne clay pit. The pseudomorphs contain 77 per cent of montmorillonite as determined by X-ray powder diffraction, differential thermal analysis, thermo-gravimetric and chemical analysis. The pseudo-hexagonal shape of the pseuodomorphs probably reflects the original crystal habit of the hornblende. The mechanism of alteration of an amphibole to a smectite is discussed.

Type
Research Article
Information
Clays and Clay Minerals , Volume 24 , Issue 2 , April 1976 , pp. 79 - 83
Copyright
Copyright © 1976 The Clay Minerals Society

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