Chalcocite : Cu2S
As recorded:
Leonard Mine, Butte Mining District, Silver Bow County, Montana, USA
Photo added to mindat.org
“Cluster of sharp, blade-like tabular chalcocite crystals with minor quartz. The large prominent iridescent colored crystal measures 6mm wide. Photo is 10mm fov.”
Daniel J. Evanich - 12th June 2019
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