Typically in low- to high-temperature hydrothermal vein deposits, in tourmaline-bearing copper deposits in granite, in some gold veins formed at high temperatures, and in recent vol canic exhalation deposits.
IMA Status:
Valid Species (Pre-IMA) 1832
Locality:
From the Llallagua, Huanuni, Tazna, and Chorolque districts, Potosi, Bolivia. Link to MinDat.org Location Data.
Chemical Formula: 