- Tennantite, Bornite
- Small Cabinet, 5.1 x 4.1 x 1.9 cm
- Butte, Butte District, Silver Bow Co., Montana, USA
Now here is a wonderful old Butte classic - a rich specimen of sharp, triangular crystals of tennantite, with gunmetal luster, on a base of bornite (with minor associated chalcopyrite). This is old material from an classic American mining locality!