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Coexisting hornblende and cummingtonite from the Khetri copper belt, Rajasthan, India

Published online by Cambridge University Press:  05 July 2018

S. P. Das Gupta
S. P. Das Gupta*
Affiliation:
Geological Survey of India, 5-5-449 Mukaramjahi Road, Hyderabad-1, A.P., India
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Summary

Coexisting hornblende and cummingtonite in an amphibolite near Peliwali have been analysed. The rock formed by Fe-Mg addition and Ca removal from pre-existing amphibole quartzites within the altered wall rocks surrounding sulphide lodes. The amphibole compositions are controlled by the bulk composition of the rock. The Mg/(Mg+Fe2+) ratio of the hornblende (0·66) is only slightly higher than that of the cummingtonite (0·64).

Type
Research Article
Information
Mineralogical Magazine , Volume 38 , Issue 299 , September 1972 , pp. 890 - 893
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1972

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