Dims: 2.1 x 1.5 x 1.4" (5.3 x 3.8 x 3.6 cm)
Wt: 2.27 oz. (64.4 g)
Mapimi, Durango, Mexico
A crust made up of scores of small Adamite crystals covers part of the limonite host rock of this large thumbnail specimen. These crystals are quite small and generally do not exceed 0.2" (5 mm) along any axis. They appear to be in generally good condition, however, and possess excellent orthorhombic prismatic form with a diamond-shaped cross-section and flat basal terminations that are truncated by secondary faces. All have the standard pale yellow color with a substantial green tinge and the classic adamantine luster, and are transparent and moderately to very clear. They are accompanied by many slightly larger calcite crystals which rest on top of the Adamite druse, protecting it. Surprisingly few of these calcites are broken, however, and most have excellent trigonal bipyramidal form. They are milky-white in color, have a pearly luster, and are dimly transparent.