Dims: 3.0" x 2.3" x 1.0"(7.6 x 5.8 x 2.5 cm)
Wt: 3.53 oz.(100.1 g)
Naica, Chihuahua, Mexico
This specimen consists of two pale blue anhydrite crystals. One is much smaller than the other and has intergrown at an angle into its larger relative's base, nearly bisecting it. Thus, two portions of the crystal's termination are visible, one on each side of the larger crystal. Both crystals are in a flat, orthorombic tabular form and have sharp, complex terminations made up of many long, thin blades that grow out of their prisms. These prisms all have thin, flat shiny basal faces, showing this mineral's one perfect cleavage plane. Both crystals have a pearly luster and a cloudy translucence. Unlike most of the Anhydrite specimens that I have seen, this one is relatively pure; there is no coating of tiny calcite crystals or smattering of metallic sulfide on its faces or edges.