Dims: 2.5" x 2.5" x 1.6" (6.4 x 6.4 x 4.1 cm)
Wt: 5.58 oz. (158.4 g)
Poison Canyon, near Grants, New Mexico, U.S.A.
This hand specimen consists of a few compact masses of fibrous Uranophane crystals. These crystals do not exceed 0.3" (8 mm) in length and are all thinner than human hair. They have the bright yellow color and waxy luster that are characteristic of this mineral. I believe that even individual needles would be essentially opaque. They rest on a base that is made of intergrown and broken calcite crystals that grow out of a limestone matrix.