Arrojadite-(PbFe)
Arrojadite-(PbFe) is an IMA-recognized mineral species in the phosphate class, with the chemical formula PbFe²⁺(CaNa₂)Fe²⁺₁₃Al(PO₄)₁₁(PO₃OH)(OH)₂.
It crystallizes in the monoclinic crystal system (space group Cc). It is a member of the Arrojadite structural group.
Key properties: Mohs hardness 3.5–4; specific gravity 3.596; White streak; Vitreous luster; optically biaxial.
IMA symbol Ajd-PbFe, IMA status: approved, named in 2005.
A high-temperature (≈ 800 °C) primary mineral in granite pegmatites.
It is found associated with Triphylite, chloritized biotite, albite.
Arrojadite indicates a member of the group with Fe2+ dominant at the M site; two suffixes indicate the dominant cation of the dominant valence state at the A and B sites.
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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