Ferroalluaudite
Ferroalluaudite is an IMA-recognized mineral species in the phosphate class, with the chemical formula NaFe²⁺Fe³⁺₂(PO₄)₃.
It crystallizes in the monoclinic crystal system (space group C2/c). It is a member of the Alluaudite structural group.
Key properties: Mohs hardness 5; specific gravity 3.67; optically biaxial.
IMA symbol Fald, IMA status: approved, named in 1957.
From zoned granite pegmatites; in phosphatic nodules.
It is found associated with Triphylite, barbosalite, ferrisicklerite, apatite.
The name refers to its dominant content of ferrous iron and relation to alluaudite.
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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