Olshanskyite

olshanskyite

sakhaite

szaibelyite

nifontovite

Images

Formula: Ca₂[B₃O₃(OH)₆]OH.3H₂O
Borate
Crystal System: Triclinic
Specific gravity: 2.19 to 2.23 measured, 2.31 calculated
Hardness: 3½ to 4
Streak: White
Colour: Colourless, white
Environments

Metamorphic environments

Localities

At the Fuka mine, Fuka, Bitchū, Takahashi City, Okayama Prefecture, Japan, olshanskyite is formed by alteration of nifontovite and some other anhydrous borates, near gehlenite-spurrite skarn. Associated minerals include nifontovite, frolovite, pentahydroborite, takedaite, sibirskite, parasibirskite, borcarite, bultfonteinite and calcite (HOM).

At the type locality, the Titovskoe B deposit, Tas-Khayakhtakh Range, Dogdo River Basin, Polar Yakutia, Sakha Republic, Russia, olshanskyite occurs in magnesian skarn, as transverse-fibrous aggregates of polysynthetically twinned crystals, 0.02-0.03 mm in size. Associated minerals include sakhaite, szaibelyite, calcite, limonite, and quartz (HOM, mindat).

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