Calaverite カラベライト 2.10 ct Octagon Cut 8.10 x 8.10 x 4.90 mm Colorado, USA max9457
Calaverite a Rare Gold Telluride mixed into chalcedony/granite matrix.
The formula is (AuTe2). Small quantity of silver may also be found.
It comes from Cripple Creek Mining District, Teller County, Colorado, USA