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A dickite with an elongated crystal habit and its dehydroxylation

Published online by Cambridge University Press:  14 March 2018

E. R. Schmidt  and
R. O. Heckroodt
E. R. Schmidt
Affiliation:
National Building Research Institute, Pretoria, Union of South Africa
R. O. Heckroodt
Affiliation:
National Building Research Institute, Pretoria, Union of South Africa
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Summary

Dickite from a new occurrence at Barkly East, Cape Province, is described and compared with a previously unreported dickite from Postmasburg and a dickite from Ouray, Colorado. The Barkly East dickite crystals are elongated in the direction of the a-axis; the ratio of length to width of crystals varies from 3:1 to 16:1. Optical, electron microscopic, X-ray, and thermal data and a chemical analysis are given. The thermogram of the fraction smaller than 2 µ e.s.d.1 is characterized by a single peak at 600°C., while that of fractions larger than 2 µ e.s.d. shows a double endothermal effect. This two-stage dehydroxylation of dickite on heating is attributed to a particle size effect.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 32 , Issue 247 , December 1959 , pp. 314 - 323
Copyright
Copyright © 1959, The Mineralogical Society

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