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Chlorite and illite in some lower Palaeozoic mudstones of mid-Wales

Published online by Cambridge University Press:  09 July 2018

L. J. Evans  and
W. A. Adams
L. J. Evans
Affiliation:
Department of Soil Science, Faculty of Agriculture, University College, Dublin 9, and Soil Science Unit
W. A. Adams
Affiliation:
University College of Wales, Aberystwyth
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Abstract

Lower Palaeozoic mudstones from Cwmcadian, Gwynedd are dominantly composed of quartz, illite and chlorite, with subordinate albite, orthoclase and rutile. Chemical formulae are determined for chlorite and illite using a combination of chemical and X-ray data. The formulae indicate that the illite is dioctahedral and suggest that the chlorite structure contains one dioctahedral and one trioctahedral layer. The hypothesis is put forward that both minerals formed from a dioctahedral mineral; illite from a non-expanded form and chlorite from an 'open' form by precipitation of a Fe2+/Mg hydroxide interlayer.

Type
Research Article
Information
Clay Minerals , Volume 10 , Issue 5 , July 1975 , pp. 387 - 397
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1975

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