Dims: 1.5 x 1.2 x 1.0" (3.8 x 3.0 x 2.5 cm)
Wt: 23.6 g w/ foam base
1390W level, 4W drift, Billie Mine, Inyo County, California, U.S.A.
At least 12 intergrown Colemanite crystals make up this thumbnail specimen. These crystals are generally in good condition, though a few are damaged and one or two are broken and incomplete. They reach maximum visible dimensions of 0.4 x 0.4 x 0.2" (1.0 x 1.0 x 0.5 cm) and have excellent monoclinic prismatic form that has an almost pseudo-rhombohedral appearance. They have well-defined edges and clean faces with a nearly vitreous luster. All are colorless, transparent, and moderately to dimly clear, depending on the level of internal fracturing present. A small amount of a dull, pale brown host rock is present, and the piece is hot-glued onto a black foam base.