Bornite pseudomorph after chalcocite, Belmont Mine, Butte, Butte District (Summit Valley District), Silver Bow Co., Montana, USA. Labelled as A Vein, 3000 Level. Ex Hatfield Goudey. Ex John Lewis Collection.
5535 Bornite after Chalcocite, Belmont Mine, Butte, Silver Bow Co., Montana, USA
