Dickinsonite-(KMnNa)
Dickinsonite-(KMnNa) is an IMA-recognized mineral species in the phosphate class, with the chemical formula K(NaMn)CaNa₃AlMn₁₃(PO₄)₁₂(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 3.496; White streak; Vitreous luster; optically biaxial.
IMA symbol Dcn-KMnNa, IMA status: approved, named in 1878.
Found in nodular masses in albitic granite pegmatite.
It is found associated with Quartz, eosphorite, triploidite, lithiophilite.
Dickinsonite indicates a member of the group with Mn2+ 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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