Manganoarrojadite-(KNa)
Manganoarrojadite-(KNa) is an IMA-recognized mineral species in the phosphate class, with the chemical formula KNa₅MnFe₁₃Al(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 4.5; specific gravity 3.53; Pale green streak; Vitreous to greasy luster; optically biaxial.
IMA symbol Majd-KNa, IMA status: approved, named in 2020.
Found in a phosphate-bearing granite pegmatite.
It is found associated with Vivianite, goyazite, quartz, calcite.
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. The prefix, mangano.
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 M minerals or help write this entry.