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Truscottite: composition and ionic substitutions

Published online by Cambridge University Press:  05 July 2018

E. E. Lachowski ,
L. W. Murray  and
H. F. W. Taylor
E. E. Lachowski
Affiliation:
Department of Chemistry, University of Aberdeen, Scotland
L. W. Murray
Affiliation:
Department of Chemistry, University of Aberdeen, Scotland
H. F. W. Taylor
Affiliation:
Department of Chemistry, University of Aberdeen, Scotland
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Summary

Eleven specimens of natural or synthetic truscottite or gyrolite-truscottite intergrowth were studied by analytical electron microscopy and X-ray powder diffraction. The results suggest that, in absence of substitution, the formula of truscottite is Ca14 (Si24O58)(OH)8 · ∼ 2H2O. Truscottite can accommodate Al and K in absence of each other to the extents of 1.4 atoms of Al or 0.5 atoms of K in the above formula. Substitution of Al causes a small increase in cell dimensions, which can approach those of reyerite, but substitution of K has negligible effect.

Type
Research Article
Information
Mineralogical Magazine , Volume 43 , Issue 327 , September 1979 , pp. 333 - 336
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1979

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