Colemanite
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Physical & Optical Properties
Mohs Hardness
Crystal System
Value & Market
Where to Buy Colemanite
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About Colemanite
Colemanite is a hydrated calcium borate mineral forming colorless to white monoclinic crystals with a vitreous luster in continental borate deposits in Turkey and the Death Valley region of California. It was named after William Tell Coleman, a California businessman who founded the borax operations that made Death Valley famous. Occasionally transparent crystals are faceted as unusual collector gemstones.