- Covellite, Pyrite
- Miniature, 4.9 x 3.9 x 2.4 cm
- East Colusa Mine, Butte, Butte District, Silver Bow Co., Montana, USA
A sharp and jagged "mountain" of iridescent peacock-blue and magenta covellite plates is perched on the sparkly, brassy, pyrite microcrystal-rich matrix on this fine old-time specimen from the East Colusa Mine at Butte. A highly representative example of the species and renowned locale.