The Mohs hardness is 1.5 – 2 and the specific gravity is 7.815.

It is a dull grey color, which exhibits a splendent luster on fresh cleavage planes.

[4] It was first described in 1815 and type localities include the Mosnap mine in Toke, Telemark, Norway; the Little Mildred mine, Sylvanite District, Hidalgo County, New Mexico and the Boly Field Mine, Dahlonega, Lumpkin County, Georgia.

[2] It occurs in low sulfur hydrothermal gold-quartz veins and occurs with native gold, native bismuth, gold tellurides, tetradymite, altaite, chalcopyrite and pyrrhotite.

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