In hydrothermal copper deposits of primary and secondary origin. Formed under a wide range of conditions; reported from mafic intrusives, as an exhalation product, and in pegmatites .
IMA Status:
Valid Species (Pre-IMA) 1844
Locality:
In the USA, at Butte, Silver Bow Co., Montana. Link to MinDat.org Location Data.
Name Origin:
From the Greek for "two kinds" or "sexes," in reference to the presumed presence of both cuprous and cupric ions.
Chemical Formula: 