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Saponite from Allt Ribhein, Fiskavaig Bay, Skye

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

This saponite, which is closely associated with zeolites such as stillbirth, heulandite, thomsonite, and gonnardite, occurs in vesicles in basalt. It has the composition: 1·02M+ (Mg5·84Mn0·01Al0·03Fe0·08) (Si6·99Al1·01)O20(OH)4, according to a new method for calculating the ionic formulae of smectites: this method also enables determination of the temperature at which all sorbed moisture is removed—in this instance about 800°C. The exchangeable cations are largely Ca2+. The chemical, thermal, and X-ray data are discussed with reference to other saponite samples. Electron-microscope examination showed a tendency to elongation in the direction of the α-axis. It is concluded that the saponite is of excellent purity and free from interstratification.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 31 , Issue 239 , December 1957 , pp. 672 - 680
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1957

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