Tincalconite

borate

borax

Formula: Na2B4O5(OH)4.3H2O
Hydrated borate containing hydroxyl
Specific gravity: 1.88
Hardness: 2
Streak: White
Colour: White, colourless in transmitted light
Environments:

Metamorphic environments

Tincalconite occurs as a dehydration product of borax in a metamorphosed bedded borate deposit in clay-shale at the type locality, Searles Lake, California, USA

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