Dims: 3.7" x 2.7" x 2.4"(9.4 x 6.9 x 6.1 cm)
Wt: 1 lb., 2.8 oz.(532 g)
Zigg Zagg Mine, Armer Ranch, Gila County, Arizona, U.S.A.
Composed almost entirely of Psilomelane, this specimen consists of a heavy base of the material out of which have grown tall botryoidal formations, like tight clusters of tiny grapes. The color of the material is black, of course, and it has a waxy to dull luster. Several of the botryoidal globules are damaged, and one can see a very tightly-packed acicular, radial habit in the cross-sections that the damage forms. This habit is also visible on the sides of the base, where the piece was separated from its place of origin. Along the largest of these breakage faces are a few patches and hollows where the Psilomelane takes on a satiny luster, due to the presence of thousands of individual microscopic crystals terminating on the surface. The underside of the specimen shows some rust staining and a tiny bit of what I think is a sandstone host. One could conceivably polish the sides and bottom of this specimen to make a truly unique decoration for a shelf or curio cabinet.