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New data for dumortierite

Published online by Cambridge University Press:  14 March 2018

G. F. Claringbull  and
M. H. Hey
G. F. Claringbull
Affiliation:
Department of Mineralogy, British Museum
M. H. Hey
Affiliation:
Department of Mineralogy, British Museum
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Summary

New chemical, optical, and X-ray data have been obtained for dumortierite. The unit cell. space group Pemn, contains 4[(Al,Fe)7BSi3O18]. Brown gem quality material from Ceylon has α 1·6860, black, [001], β 1·722, deep redbrown, and γ, 1·7229, brown, with 2Vα 13° , γ > υ. X-ray powder data are given.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 31 , Issue 242 , September 1958 , pp. 901 - 907
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1958

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References

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