gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1969.037.287.08 ELectron Microprobe Analyses of Chlorine in Hornblendes and Biotites from the Charnockitic Rocks of Kondapalli, India Leelanandam C. Ph.D. (Osmania), Ph.D. (Cantab.) Department of Mineralogy and Petrology, University of Cambridge1

Present address: Geology Department, Osmania University, Hyderabad-7, India.

 9 1969 37 287 362 365 27 11 1968 Copyright © 1969, The Mineralogical Society 1969 Summary

Chlorine is estimated in nine hornblendes (0·13–1·12%) and nine biotites (0·19–0·62%) from the Kondapalli charnockites for the first time, using the electron microprobe. The data obtained suggest that these Kondapalli minerals are unexpectedly and unusually rich in Cl, which is well equilibrated in the five available coexisting hornblende-biotite pairs.