Dims: 8.52x6.12x4.43" (21.64x15.55x11.26cm)
Wt: 46.56oz (1320g)
Aztec Mine, Santa Cruz County, Arizona, USA
Although this specimen is a bi-product of a copper mining operation, it is still a spectacular specimen displaying an enormous crystal of chalcanthite. It is, of course, a bright blue color with a vitreous luster. The huge chalcanthite crystal is part of a cluster of large crystals, and there are several more clusters of smaller crystals scattered over the host rock. Speaking of the host rock, it appears to be a sandstone cemented together with a sky-blue mineral that looks like chrysocola, but a close examination reveals tiny transparent crystals, suggesting that they are cyanotrichite.