Dims: 3.0" x 1.5" x 0.9" (7.6 x 3.8 x 2.3 cm)
Wt: 1.91 oz. (54.2 g)
79 Mine, Hayden, Gila County, Arizona, U.S.A.
There is just enough of the chalky, cream-colored host rock on this specimen to denote the Aurichalcite-lined hollow that makes it up. This hollow is completely lined with the pale-blue mineral, which occurs in the form of crystals that do not exceed 2 mm in any dimension. Being sheltered in the hollow, they are in excellent condition, and are intergrown so as to produce many small, botryoidal formations. The crystals are a bit too large to create a silky sheen, but do show tiny flashes of a bright, pearly luster. The material appears to be nearly transparent in some areas, and is at least dimly translucent everywhere else. There are a few small crevices in the thin shell of host rock that are not directly connected with the main hollow.