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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)(Al0·19Ti0·00Fe31·27Fe20·01Mn0·07Mg3·34)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.

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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