Images
Formula: Na2B4O5(OH)4.3H2O
Hydrated borate containing hydroxyl
Crystal System: Trigonal
Specific gravity: 1.88 measured, 1.894 calculated
Hardness: 2
Streak: White
Colour: White, colourless in transmitted light
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
(Mindat). The tincalconite forms pseudomorphs after
borax
(KL p185).
Back to Minerals