Beusite-(Ca)
Beusite-(Ca) is an IMA-recognized mineral species in the phosphate class, with the chemical formula CaMn²⁺₂(PO₄)₂.
It crystallizes in the monoclinic crystal system (space group P2_1/c). It is a member of the Graftonite structural group.
Key properties: Mohs hardness 5; specific gravity 3.61; Very pale brown streak; Vitreous luster; optically biaxial.
IMA symbol Beu-Ca, IMA status: approved, named in 2017.
A common primary phosphate in a beusite-triphylite nodule (6×5×3 cm) in beryl- columbite-phosphate subtype of zoned rare-element pegmatites, in a small dike, which cuts an interlayered sequence of amphibolite and granodiorite.
It is found associated with Triphylite-lithiophilite, sarcopside.
The suffix indicates the Ca-analogue of beusite.
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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