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On the X-ray identification of amblygonite and montebrasite

Published online by Cambridge University Press:  05 July 2018

A. A. Moss ,
E. E. Fejer  and
P. G. Embrey
A. A. Moss
Affiliation:
Department of Mineralogy, British Museum (Natural History), London S.W. 7
E. E. Fejer
Affiliation:
Department of Mineralogy, British Museum (Natural History), London S.W. 7
P. G. Embrey
Affiliation:
Department of Mineralogy, British Museum (Natural History), London S.W. 7
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Summary

Previous investigations have been confined to individual members or to small compositional ranges of the amblygonite-montebrasite series. The present study is a survey based on twenty-two specimens in the range Amb14Mon86 to Amb92Mon8 (1·8–11·8 % fluorine), and indicates that the fluorine content may be related both qualitatively and quantitatively to differences in the X-ray powder patterns. Fully indexed powder data to d = 1·68 Å and derived cell parameters are given for four members of the series. There is no evidence of a break in the continuity of the series. The first British occurrence of both amblygonite and montebrasite is reported from a pegmatite vein in aplite at Meldon, Okehampton, Devonshire.

Type
Research Article
Information
Mineralogical Magazine , Volume 37 , Issue 287 , September 1969 , pp. 414 - 422
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1969

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