1972•Mineralogical MagazineRequires access

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

S. P. Das Gupta

Abstract

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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Key concepts: Hornblende, Amphibole, Geology, Geochemistry, Biotite, Quartz, Paleontology