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Partially-ordered mixed-layer mica-montmorillonite from Maitland, New South Wales

Published online by Cambridge University Press:  09 July 2018

J. D. Hamilton
J. D. Hamilton*
Affiliation:
Division of Building Research, Commonwealth Scientific and Industrial Research Organization, Melbourne, Australia
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Abstract

A mixed-layer clay mineral from a Permian sandstone at Maitland, New South Wales has been identified as 2:1 mica-montmorillonite structure with ‘imperfectly regular’ interstratification. The results from Fourier transform analysis and Fourier synthesis of 00l X-ray diffraction data have not fully elucidated the interlayering patterns but have indicated that there is complete alteration in the stacking and that the 1:1 (allevardite type) layer sequence relationship is strongly developed.

X-ray diffraction, differential thermal, thermogravimetric, chemical, cation exchange and electron microscopic data for the mineral are given. The chemical analysis for the Na+-saturated material gives the structural formula

K0.90 Ca0.06 Na0.49 [Al3.52, Fe0.183+ Mg0.27 Ti0.03 (Al1.24 Si6.76) O20 (OH)4] H2O

It is considered that most of the fixed K+ and Ca++ ions are probably held in the mica interlayers, while the exchangeable components are largely accommodated in the expanded montmorillonite zones.

Type
Research Article
Information
Clay Minerals , Volume 7 , Issue 1 , July 1967 , pp. 63 - 78
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1967

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