Tincalconite

tincalconite

borate

kernite

borax

Images

Formula: Na₂B₄O₅(OH)₄.3H₂O
Hydrated tetraborate
Crystal System: Trigonal
Specific gravity: 1.88 measured, 1.894 calculated
Hardness: 2
Streak: White
Colour: White, colourless in transmitted light
Environments:

Evaporite deposits

Localities

At the type locality, Searles Lake, San Bernardino County, California, USA, tincalconite occurs as a dehydration product of borax in a metamorphosed bedded borate deposit in clay-shale (Mindat).
The tincalconite forms pseudomorphs after borax (KL p185).
Tincalconite from Searle's Lake - Image

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