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Electron—Optical Investigations on Montmorillonites—II: Morphological Variations in the Intermediate Members of the Montmorillonite-Beidellite Series

Published online by Cambridge University Press:  01 July 2024

N. Güven  and
R. W. Pease
N. Güven
Affiliation:
Department of Geosciences, Texas Tech University, P.O. Box 4109, Lubbock, Texas 79409, U.S.A.
R. W. Pease
Affiliation:
Department of Geosciences, Texas Tech University, P.O. Box 4109, Lubbock, Texas 79409, U.S.A.
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Abstract

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Dioctahedral aluminum smectites from bentonite deposits in Argentina, Brazil, Czechoslovakia and Japan represent, according to the MgO content of the bulk samples, intermediate members in the montmorillonite-beidellite series. The smectite particles in these samples occur in a variety of forms such as; (a) laths and diamond-shaped units with a well developed crystal habit, (b) loosely folded aggregates with an irregular morphology and (c) flat and compact lamellae with well developed {001} forms but with complete lack of {hk0} forms. Such lamellae have been described in two groups: the thin ones (10–50 Å) and the thicker ones. Thin lamellae may give SAD spot patterns with a non-hexagonal symmetry. Lamellae having thicknesses greater than 50 Å resemble a single crystal but their SAD patterns indicate that they do not have a three-dimensional periodicity.

The question arises whether the morphologically different particles in a sample belong to the same intermediate phase or if they represent different members in the montmorillonite-beidellite series coexisting in the same sample.

Type
Research Article
Information
Clays and Clay Minerals , Volume 23 , Issue 3 , June 1975 , pp. 187 - 191
Copyright
Copyright © 1975, The Clay Minerals Society

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