Pseudosinhalite
Pseudosinhalite is an IMA-recognized mineral species in the borate class, with the chemical formula Mg₂Al₃B₂O₉(OH).
It crystallizes in the monoclinic crystal system (space group P2_1/c).
Key properties: specific gravity 3.508; White streak; Vitreous luster; optically biaxial.
IMA symbol Pshl, IMA status: approved, named in 1997.
A rare mineral found in a contact-metasomatic boron-rich iron deposit, a product of retrograde alteration of sinhalite in magnesium-bearing skarn.
It is found associated with Forsterite, spinel, ludwigite, warwickite, suanite, szaibélyite, brucite, clinohumite, sinhalite, hydrotalcite.
Its name comes from the Greek for false, in recognition of its close relation to sinhalite.
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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