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Formula: CaH(BO3)
Anhydrous borate
Crystal System: Monoclinic
Specific gravity: 2.58 measured, 2.59 calculated
Streak: White
Colour: Colourless, dark grey when included by chlorite
Solubility: Insoluble in boiling water, soluble in cold acetic or hydrochloric acid (AM 48.433)
Environments
Sibirskite occurs in veinlets and aggregates in skarn
(HOM).
Localities
At the Fuka mine, Fuka, Bicchu-cho, Takahashi City, Okayama Prefecture, Japan, the deposit is a high-temperature,
boron-containing skarn
(R&M 965.395). Sibirskite is associated with
takedaite, nifontovite,
olshanskyite,
pentahydroborite, frolovite,
parasibirskite, uralborite,
borcarite, fluorite and
calcite
(HOM).
At the type locality, the Yuliya Svintsoviya deposit, Khakassia, Russia, sibirskite occurs in
skarn near the contact of
limestone with granite.
Associated minerals include
calcite, chlorite,
pyrite, garnet,
vesuvianite, datolite,
tourmaline and axinite
(AM 48.433, HOM).
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