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Tacharanite

Published online by Cambridge University Press:  05 July 2018

G. Cliff ,
J. A. Gard ,
G. W. Lorimer  and
H. F. W. Taylor
G. Cliff
Affiliation:
Department of Metallurgy, The University, Manchester, England
J. A. Gard
Affiliation:
Department of Chemistry, University of Aberdeen, Scotland
G. W. Lorimer
Affiliation:
Department of Metallurgy, The University, Manchester, England
H. F. W. Taylor
Affiliation:
Department of Chemistry, University of Aberdeen, Scotland
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Summary

Tacharanite has been re-examined using electron microscopy and diffraction, analytical microscopy, X-ray powder and fibre rotation photographs, and other methods. The composition approximates to Ca12Al2Si18O69H36, and the X-ray diffraction patterns can be referred to an A-centred monoclinic pseudo-cell with a 17·07, b 3·65, c 27·9 Å, β 114·1°, Z = 1. In the true cell b is certainly, and a and c probably, doubled. Small, reversible changes in pseudo-cell parameters occur on heating below 200°C, and parameters found by electron diffraction differ slightly from those found with X-rays, presumably due to shrinkage on dehydration in the high vacuum of the electron microscope. An earlier report that tacharanite changes into a mixture of tobermorite and gyrolite on standing in air is not confirmed. Tacharanite shows some important resemblances to tobermorite, but there are also significant differences.

Type
Research Article
Information
Mineralogical Magazine , Volume 40 , Issue 310 , June 1975 , pp. 113 - 126
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1975

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