Natrodufrénite
Natrodufrénite is an IMA-recognized mineral species in the phosphate class, with the chemical formula NaFe²⁺Fe³⁺₅(PO₄)₄(OH)₆·2H₂O.
It crystallizes in the monoclinic crystal system. It is a member of the Dufrénite structural group.
Key properties: specific gravity 3.2; Green streak; optically biaxial.
IMA symbol Ndf, IMA status: approved, named in 1981.
A low-temperature secondary mineral.
It is found associated with Cyrilovite, goethite.
The name refers to essential sodium, natrium, and its relation to dufrénite.
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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