Temagamite is a bright white palladium mercury with a hardness of 2 1⁄2 on the Mohs scale. Its chemical formula is Pd 3. It was discovered at the Temagami Mine on Temagami Island and it represents a rare mineral in the Temagami Greenstone Belt.
It occurs as microscopic inclusions within massive chalcopyrite at Temagami in association with other rare tellurides: merenskyite and an unnamed Pd-Hg-Ag telluride. In addition to the discovery locality, it has been reported from the Stillwater igneous complex in Montana and the New Rambler copper mine in the Medicine Bow Mountains