Dims: 2.9 x 1.8 x 1.3" (7.4 x 4.6 x 3.3 cm)
Wt: 3.2 oz. (90.5 g)
Pingwu, Sichuan Province, China
Two or three partly intergrown Cassiterite crystals rest on the muscovite host rock of this small hand specimen. The largest crystal is at least 3 times as large as the next largest, and has dimensions of 0.6 x 0.5 x 0.4" (1.5 x 1.3 x 1.0 cm). Only the largest crystal shows any visible damage, and it is minor. All have very good tetragonal form, with slightly disjointed but well-defined edges and striated but clean faces that possess a bright, almost adamantine luster. Their color is essentially black, even under a halogen light, and thus they are opaque. The muscovite base consists of a layer of intergrown "books" that rests atop a layer of finely-grained, massive material. Among the muscovite books rest several small, tabular goshenite beryl crystals (see the close-up image, lower right corner)- these are generally in excellent condition and have excellent hexagonal tabular form, with well-defined edges and clean faces that possess the standard vitreous luster. They are colorless, transparent, and very clear.