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Phosphate

Arrojadite-(BaNa)

BaNa₃(NaCa)Fe²⁺₁₃Al(PO₄)₁₁(PO₃OH)(OH)₂
Hardness4–5
Crystal systemMonoclinic
ClassPhosphate
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Arrojadite-(BaNa)

Arrojadite-(BaNa) is an IMA-recognized mineral species in the phosphate class, with the chemical formula BaNa₃(NaCa)Fe²⁺₁₃Al(PO₄)₁₁(PO₃OH)(OH)₂.

It crystallizes in the monoclinic crystal system (space group C2/c). It is a member of the Arrojadite structural group.

Key properties: Mohs hardness 4–5; specific gravity 3.54; White streak; Greasy to vitreous luster; optically biaxial.

IMA symbol Ajd-BaNa, IMA status: approved, named in 2014.

Found as a primary mineral in the blocky-plagioclase zone of a granitic pegmatite. Product of very low-grade metamorphism of phosphatic ironstone shales and mudstones (Big Fish River).

It is found associated with Fluorapatite, albite (Luna); arrojadite-(KNa), satterlyite, gormanite, apatite/‘francolite’, siderite, quartz, pyrite (Big Fish).

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.