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The illite in some Old Red Sandstone soils and sediments

Published online by Cambridge University Press:  14 March 2018

R. C. Mackenzie
R. C. Mackenzie*
Affiliation:
The Macaulay Institute for Soil Research, Craigiebuckler, Aberdeen
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Summary

An illite separated from an Upper Old Red Sandstone sediment at Denholm Hill Quarry, Roxburghshire, when examined by optical, X-ray, and chemical methods, appeared to be closely similar to Fithian illite. Its composition was , where M+ for the Ca-saturated sample was [(H3O)0·58Ca0·10Na0·06K1·12]. The differential thermal curve showed two peaks: one at 550° C. and the other at 600° C. (i.e. somewhat intermediate between the Fithian and Ballater illites). The dehydration curve was also intermediate. Electron-microscope examination showed rather better crystallization than in Fithian illite. The possible reasons for variation of the illite peak temperature are discussed.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 31 , Issue 239 , December 1957 , pp. 681 - 689
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1957

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