In low-temperature polymetallic deposits with silver sulfosalts (Freiberg, Germany); in high-temperature Sn-Ag deposits (Bolivia).
IMA Status:
Valid Species (Pre-IMA) 1886
Locality:
From the Himmelsfurst and other mines, Erbisdorf, near Freiberg, Saxony, Germany. In the Fournial mine, Massiac region, Cantal, France. Link to MinDat.org Location Data.