Colemanite Kern County, California Dimensions: 3.8 × 2.7 × 1.8 cm Provenance: Older collection specimen; original catalog label No. 290 included.
Colorless to creamy-white Colemanite forms translucent crystalline aggregates with bright vitreous to pearly luster. Numerous intergrown crystals and sparkling microcrystalline surfaces create a highly textured specimen with attractive areas of transparency.
Colemanite is a hydrated calcium borate mineral that forms in borate-rich evaporite deposits and is an important natural source of boron.
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