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On 'winchite' from the original locality at Kajlidongri, India

Published online by Cambridge University Press:  05 July 2018

V. K. Nayak  and
Bernard E. Leake
V. K. Nayak
Affiliation:
Centre of Advanced Study in Geology, University of Saugar, P.O. Saugar (M.P.), 470-003, India
Bernard E. Leake
Affiliation:
Department of Geology, The University, Glasgow G12 8QQ
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Summary

A new analysis of the violet amphibole from the original locality where winchite came from agrees with another recent analysis in differing substantially from the original winchite composition and is (K0·17Na2·10Ca0·23)(Al0·19Ti0·00Fe3 1·27Fe2 0·01Mn0·07Mg3·34)Si8·01O22·05(OH)1·95. It is essentially a magnesio-arfvedsonite. Although it is possible that the original analysis was unreliable, evidence is given to support the alternative view that there is a wide range of blue alkali and soda calcic amphibole compositions at Kajlidongri and the name winchite should be restricted to compositions between ferri-winchite CaNaMg5Fe3+Si8O22(OH,F,Cl)2 and alumino-winchite CaNaMg5Al Si8O22(OH,F,Cl)2. X-ray, density, and optical data on the analysed mineral are given.

Information

Type
Research Article
Information
Mineralogical Magazine , Volume 40 , Issue 312 , December 1975 , pp. 395 - 399
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1975

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