Colemanite

borate

borax

Formula: CaB3O4(OH)3.H2O borate
Specific gravity: 2.4
Hardness: 4½
Streak: White
Colour: Colourless, white
Solubility: Slightly soluble in water
Environments:

Sedimentary environments

Colemanite occurs in borax lake bed deposits and sediments, in arid alkali environments. Ulexite and borax are usually associated, and colemanite is believed to have originated by their alteration.

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