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Coexisting hornblende and cummingtonite from the Khetri copper belt, Rajasthan, India
Published online by Cambridge University Press: 05 July 2018
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).
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- Research Article
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- Copyright © The Mineralogical Society of Great Britain and Ireland 1972