Jahnsite-(NaMnMn)
Jahnsite-(NaMnMn) is an IMA-recognized mineral species in the phosphate class, with the chemical formula NaMn²⁺(Mn²⁺Fe³⁺)Fe³⁺₂(PO₄)₄(OH)₂·8H₂O.
It crystallizes in the monoclinic crystal system (space group P2/a). It is a member of the Jahnsite structural group.
IMA symbol Jah-NaMnMn, IMA status: approved, named in 2019.
A low temperature, secondary mineral produced through alteration of primary phosphates in zoned granitic pegmatite.
It is found associated with Data pending full publication.
Root name, Jahnsite, indicates a member of the group with M(3) = Fe3+; the suffix indicates sequentially the dominant atom in the X, M(1), and M(2) structural positions.
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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