Dims: 2.0" x 1.2" x 1.1" (5.1 x 3.0 x 2.8 cm)
Wt: 1.08 oz. (30.6 g)
Boron, Kern County, California, U.S.A.
This thumbnail specimen consists of several intergrown clusters of Colemanite blades. These blades range in length from 2 mm to nearly 2" (5 cm). Though several show obvious damage, many others are in good condition and show excellent monoclinic form, with sharp edges and striated but clean faces that have a bright, vitreous luster. The blades are colorless and transparent, though inclusions and their intergrowth make it difficult to see through many of them. There is no host rock of any sort on the piece- I think that this was part of a larger cluster or formation that likely broke off during its mining.