In hydrothermal gold-quartz veins, in portions deficient in sulfur and containing other antimony minerals.
IMA Status:
Valid Species (Pre-IMA) 1952
Locality:
In the Giant Yellowknife mine, Northwest Territories; in the Chesterville mine, Larder Lake; and the Hemlo gold deposit, Thunder Bay district, Ontario, Canada. Link to MinDat.org Location Data.