Dims: 3.09x2.06x1.01" (7.84x5.22x2.56cm)
Wt: 4.85oz (137.2g)
Dzhezkazgan mine, Kazakhstan
On this specimen, the host rock is nearly covered on one surface with chalcocite crystals. They range in size up to 13mm, and have a dark gray color and metallic luster. The crystals are all distorted and show only strong hints of a hexagonal cross section, although many of them show characteristic blunt terminations and all show strong striations. There are other minerals present, both tiny quartz crystals, many golden chalcopyrite crystals, and several patches of tiny blue metallic crystals that look like bornite (they could, of course, be more chalcocite tarnished blue, but then why would the large crystals not have a blue tarnish?).