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Colemanite - Overview
Colemanite or hydrated calcium borate (Ca2B6O11.5H2O) is a colorless or white monoclinic crystal which formed by the evaporation of deposits together with other borates. Colemanite is a secondary mineral which derived from borax and ulexite. Colemanite is a common natural source of insoluble boron and also one of the more stable borate mineral.
Colemanite is a significant ore of boron and was the most impoertant ore prior to the discovery of Kernita in 1926. It is used as an ore of boron and as a source of borax (a cleaning agent and useful for industrial chemical)