Colemanite

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Colorless gemmy crystals of colemanite measuring to 0.7 cm in size covering the top of matrix. In good condition.The Kramer Mine, located in Boron within Kern County, California, is world-famous for its massive deposit of sodium borate minerals formed in an ancient Miocene lake bed. Discovered in 1925 by Dr. C. A. Suckow, the site rapidly developed into one of the largest borate operations globally, transitioning from underground shafts to an enormous open-pit mine run by U.S. Borax. Beyond its massive industrial production, the mine is celebrated among mineral collectors as the type locality for tincalconite and for producing superb, museum-quality specimens of borax, kernite, probertite, and ulexite.