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Mboziite, a new sodic amphibole end-member

Published online by Cambridge University Press:  14 March 2018

P. W. G. Brock ,
D. C. Gellatly  and
O. von Knoebing
P. W. G. Brock
Affiliation:
Dept. of Geology, University of Leeds, Leeds 2
D. C. Gellatly
Affiliation:
Dept. of Geology, University of Leeds, Leeds 2
O. von Knoebing
Affiliation:
Dept. of Geology, University of Leeds, Leeds 2
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Summary

An amphibole occurring in the Mbozi syenite–gabbro complex in SW. Tanganyika approaches very closely to the theoretical end-member Na2Ca;it has α 1·705, pale to light yellow, β 1·713, deep blue-green, γ 1·715, deep blue to green to black, with γ ∥ [010] and β : [001] about 7 to 14°; absorption γ > β ≫ α, with the maximum absorption on (010) at 9 to 12° to [001]. The mineral shows anomalous bright orange-red interference colours and incomplete extinction in sections parallel to (010) even in monochromatic light. X-ray powder data are given. A very similar amphibole occurs in the Darkainle nepheline-syenite complex, Borama district, Somali Republic.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 33 , Issue 267 , December 1964 , pp. 1057 - 1065
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1964

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References

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