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Phosphate

Arrojadite-(SrFe)

SrFe²⁺(CaNa₂)Fe²⁺₁₃Al(PO₄)₁₁(PO₃OH)(OH)₂
Hardness3.5–4
Crystal systemMonoclinic
ClassPhosphate
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Arrojadite-(SrFe)

Arrojadite-(SrFe) is an IMA-recognized mineral species in the phosphate class, with the chemical formula SrFe²⁺(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 3.569; White streak; Vitreous luster; optically biaxial.

IMA symbol Ajd-SrFe, IMA status: approved, named in 2005.

Found in metaquartzite formed under amphibolite facies conditions.

It is found associated with Kyanite, muscovite, wagnerite, lazulite, rutile, quartz, fluorapatite.

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. Browse more A minerals or help write this entry.