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A chromian tourmaline from Swat, West Pakistan

Published online by Cambridge University Press:  05 July 2018

M. Qasim Jan ,
D. R. C. Kempe  and
R. F. Symes
M. Qasim Jan
Affiliation:
Department of Geology, University of Peshawar, West Pakistan
D. R. C. Kempe
Affiliation:
Department of Mineralogy, British Museum (Natural History), London S.W. 7.
R. F. Symes
Affiliation:
Department of Mineralogy, British Museum (Natural History), London S.W. 7.
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Summary

Traces of a green chromian tourmaline occur in calcareous rocks in contact with serpentinite near Alpurai, Swat, West Pakistan. The petrography of the rocks and the optical properties of the tourmaline are presented along with its chemistry (it contains over 8 % Cr2O3 and about 0·2 % V2O3). The mineral is compared with other chromian tourmalines and its paragenesis discussed: it is thought to have been produced by silica-rich hydrothermal (or gaseous) solutions, which have crystallized as thin quartz veins in the calcareous rocks, introducing boron and other constituents.

Type
Research Article
Information
Mineralogical Magazine , Volume 38 , Issue 298 , June 1972 , pp. 756 - 759
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1972

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