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A study of a long-spacing mica-like mineral

Published online by Cambridge University Press:  09 July 2018

W. F. Cole
W. F. Cole*
Affiliation:
Division of Building Research, Commonwealth Scientific and Industrial Research Organization, Melbourne, Australia
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Abstract

An interstratified clay mineral from Surges Bay, Tasmania, described by Cole & Carthew (1953) as containing a random stacking of illite and montmorillonite in the ratio of 3:2 and a regular stacking of illite and montmorillonite in the ratio of 1 : 1 is re-examined, after purification, and a new interpretation is made of the X-ray diffraction effects in terms of a single complex stacking model. The Fourier transform method of analysis used with an appropriate layer structure factor shows that the interstratification is produced by a three component stacking of 18% single mica layers (A), 10% double mica layers (ĀĀ) and 72% allevardite-like layers (ĀB̄) in which the A and ĀĀ layers are never together. This leads to the conclusion that the near regular interstratification of the mineral is due to structural and/or compositional variation from layer to layer within the parent crystals as suggested by Sudo, Hayashi & Shimoda (1962) to explain similar mineral types occurring in Japan.

Type
Research Article
Information
Clay Minerals , Volume 6 , Issue 4 , December 1966 , pp. 261 - 281
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1966

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