Ferrobobfergusonite
Ferrobobfergusonite is an IMA-recognized mineral species in the phosphate class, with the chemical formula Na₂Fe²⁺₅Fe³⁺Al(PO₄)₆.
It crystallizes in the monoclinic crystal system (space group P2_1/n). It is a member of the Alluaudite-Wyllieite structural group.
Key properties: Mohs hardness 5; specific gravity 3.68; Pale green-yellow streak; Vitreous luster; optically biaxial.
IMA symbol Fbfg, IMA status: approved, named in 2017.
It is found associated with Ferrowyllieite, schorl, fillowite, arrojadite, quartz, muscovite.
Prefix, ferro, identifies the iron-dominant analog of bobfergusonite.
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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