gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1975.040.312.08 On ‘Winchite’ from the Original Locality at Kajlidongri, India Nayak V. K. Centre of Advanced Study in Geology, University of Saugar, P.O. Saugar (M.P.), 470-003, India Leake Bernard E. Department of Geology, The University, Glasgow G12 8QQ 12 1975 40 312 395 399 7 12 1974 Copyright © 1975, The Mineralogical Society 1975 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.