Colemanite Mining


Colemanite is a hydrated calcium borate, an altered variation of borax. Over 200 minerals contain boron, but colemanite is one of only a few which is commercially important. It contains 50% B2O3. It forms at a lower pH and warmer temperature than other borates including ulexite.


Type Crystal System
Mineral Monoclinic
Mineral Classification Color
Inoborates White, clear, colorless, gray
Chemical Formula Luster
CaB3O4(OH)3·H2O Vitreous
Streak Fracture
White Conchoidal
Mohs Hardness

See Boron

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