Widely distributed in selenium deposits of hydrothermal origin; locally abundant with other selenides.
IMA Status:
Valid Species (Pre-IMA) 1818
Locality:
In Canada, in the Martin Lake mine near Lake Athabasca, Saskatchewan, and in the Kidd Creek mine, near Timmins, Ontario. Link to MinDat.org Location Data.
Name Origin:
From the Greek for "opportunity," because it was discovered shortly after discovery of the element selenium.
Chemical Formula: 