Dims: 3.2 x 2.1 x 1.6" (8.2 x 5.2 x 4.1 cm)
Wt: 13.1 oz. (372 g)
Mountain Consolidated Mine, Butte, Montana, U.S.A.
A thick layer of semicrystalline Bornite rests on the pyrite/chalcopyrite base of this small cabinet specimen. The crust is generally in very good condition, showing no fresh damage, and exhibits some warped form, but I cannot define it. Its iridescent, deep-blue color is quite obvious, and its luster is nearly matte. The accompanying pyrite and chalcopyrite is much more crystalline in nature, and several crystals of one or the other are visible.