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Relationships among 2:1 layer silicates

Published online by Cambridge University Press:  05 July 2018

E. J. W. Whittaker
E. J. W. Whittaker*
Affiliation:
Department of Geology and Mineralogy, University of Oxford
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Summary

The relationships between the 2:1 layer silicates are discussed in terms of the charge balance between the ions occupying X, Y, and Z sites. This brings out the relationship of glauconite to the illites, and clarifies the reason for the ideal occupancy of the Y sites in montmorillonite. It not only shows hectorite, saponite, and sauconite to be tri-octahedral smectites, but also shows vermiculite to be a tri-octahedral analogue of the illites. Apparently anomalous differences in permitted compositions of the di-octahedral and tri-octahedral micas are explained in terms of mismatch between the tetrahedral and octahedral layers, and it is shown that ephesite is to be regarded as a tri-octahedral common mica, not an analogue of margarite. Anandite is the nearest known naturally occurring equivalent to a tri-octahedral analogue of margarite, but the true analogue is a barium magnesium mica synthesized by Frondel and Ito.

Type
Research Article
Information
Mineralogical Magazine , Volume 37 , Issue 286 , June 1969 , pp. 206 - 209
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1969

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References

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