Manganonaujakasite
Manganonaujakasite is an IMA-recognized mineral species in the silicate class, with the chemical formula Na₆Mn²⁺Al₄Si₈O₂₆.
It crystallizes in the monoclinic crystal system (space group C2/m).
Key properties: Mohs hardness 3–4; specific gravity 2.67; Vitreous to pearly luster; optically biaxial.
IMA symbol Mnj, IMA status: approved, named in 1999.
Found in lovozerite-lomonosovite nepheline syenite in an alkaline massif.
It is found associated with Na-K feldspar, villiaumite, sodalite, nepheline, analcime, aegirine, tisinalite, lamprophyllite.
The prefix, mangano, indicates the manganese analog of naujakasite.
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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