Miniature, 3.7 x 3.0 x 2.8 cm
Boraxo Mine (Kern Borate; Boraxo Deposit; Boraxo No. 1 and No. 2; Clara Claim; Thompson Mine; Tenneco Mine), Inyo Co., California, USA
A pair of intergrown Colemenite crystals. These crystals have a sharp, excellent habit with modified edges and translucent to gemmy interiors. Formed in evaporite deposits, Colemanite is a secondary mineral that forms by the alteration of Borax and Ulexite. The largest crystal is 2.3 cm on edge. Ex. Charlie Key Collection.