Dims: 3.2 x 2.2 x 1.3" (8.1 x 5.6 x 3.3 cm)
Wt: 12.4 oz. (352 g)
Kuse Mine, near Bau, Sarawak, Borneo
This specimen is mostly native Arsenic by weight. The Arsenic occurs as two slightly botryoidal layers that coat both sides of the gray calcareous host rock. The Arsenic shows no crystal form but has definite botryoidal tendencies and visible layering- its color is a dull black-brown, and its luster is very dull. A tiny bit of realgar is visible lining tiny pockets in the thicker layer, and both layers serve as a matrix for many small stibnite crystals. A few bits of a thin, white calcite crust partly coat the thinner layer.