White crystal aggregates of the rare borate mineral parasibirskite from the type locality: Fuka Mine, Bitchu-cho, Takahashi, Honshu Island, Japan. — Photo: David Hospital · CC BY-SA 4.0
Parasibirskite
Parasibirskite is an IMA-recognized mineral species in the borate class, with the chemical formula Ca₂B₂O₅·H₂O.
It crystallizes in the monoclinic crystal system (space group P2_1/m).
Key properties: specific gravity 2.5; “Weak”, pearly luster; optically biaxial.
IMA symbol Psib, IMA status: approved, named in 1996.
A late-stage hydrothermal alteration of takedaite in a borate-rich vein cutting limestone and gehlenite-spurrite skarn.
It is found associated with Takedaite, frolovite, olshanskyite, sibirskite, pentahydroborite, calcite.
As a polymorph of sibirskite.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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