- Bornite, Quartz
- Miniature, 5.0 x 3.7 x 1.6 cm
- Leonard Mine, Butte, Butte District, Silver Bow Co., Montana, USA
Three large, sharp, discrete bornite crystals set on a contrasting quartz crystal plate from the famous Leonard Mine at Butte. The lightly iridescent crystals reach 2.0 cm, close to the maximum of 3.0 cm noted at Butte in the literature. Ex. George Elling Collection.