Penobsquisite
Penobsquisite is an IMA-recognized mineral species in the halide class, with the chemical formula Ca₂Fe²⁺[B₉O₁₃(OH)₆]Cl·4H₂O.
It crystallizes in the monoclinic crystal system (space group P2_1).
Key properties: Mohs hardness 3; specific gravity 2.26; White streak; Vitreous luster; optically biaxial.
IMA symbol Pnb, IMA status: approved, named in 1995.
A very rare residual mineral, obtained by dissolution of halite in a drillcore through a marine evaporite series.
It is found associated with Halite, sellaite, fluorite, boracite, hilgardite, pringleite, trembathite, brianroulstonite, hematite, malachite.
The name refers to the Penobsquis mine, Canada, first source of the mineral.
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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