It was first described in 1815 .
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 .
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 .