Graftonite-(Ca)
Graftonite-(Ca) is an IMA-recognized mineral species in the phosphate class, with the chemical formula CaFe²⁺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 3.592; Colorless streak; Vitreous luster; optically biaxial.
IMA symbol Gft-Ca, IMA status: approved, named in 2017.
A common primary phosphate in beryl-columbite-phosphate subtype of zoned rare- element pegmatites related to anatectic melts.
It is found associated with Sarcopside, graftonite-(Mn), maneckiite, triphylite oxidized topotactically to ferrisicklerite and heterosite.
The suffix indicates the M1Ca-analogue of graftonite, M(1)FeM(2), M(3)Fe2(PO4)2.
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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