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From Colusa + -ite, named for the Colusa claim, specifically the Leonard Mine area, near Butte, Montana, United States, by Reno H. Sales, chief geologist for Anaconda Copper Mining Company.
Etymology from Wiktionary, CC BY-SA 4.0.
colusite
Today it means: An isometric-hextetrahedral bronze mineral containing antimony, arsenic, copper, germanium, sulfur, tin, and vanadium. Full definition →