Parabrandtite
Parabrandtite is an IMA-recognized mineral species in the arsenate class, with the chemical formula Ca₂Mn²⁺(AsO₄)₂·2H₂O.
It crystallizes in the triclinic crystal system. It is a member of the Fairfieldite structural group.
Key properties: Mohs hardness 3–4; specific gravity 3.55; White streak; Vitreous luster; optically biaxial.
IMA symbol Pbdt, IMA status: approved, named in 1986.
Very rare, in a vein in primary ore from a metamorphosed stratiform zinc orebody.
It is found associated with Sarkinite, franklinite, willemite, calcite.
Its name comes from the Greek para, for near, and its dimorphous relation to brandtite.
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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