Ulexite

borate

borax

Formula: NaCaB5O6(OH)6.5H2O borate
Specific gravity: 1.96
Hardness: 1 to 2½
Streak: White
Colour: Colourless, white
Solubility: Slightly soluble in water
Environments:

Sedimentary environments

Ulexite crystallises in arid regions from brines that have concentrated in enclosed basins, as in playa lakes. It is usually associated with borax.

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