Nickenichite Locality: Nickenichite-bearing fumarole, Nickenicher Sattel (Eicher Sattel), Eich, Andernach, Eifel Mts, Rhineland-Palatinate, Germany Field of view 4 mm. Specimen and photo Leon Hupperichs. — Photo: Leon Hupperichs · CC BY-SA 3.0
Nickenichite
Nickenichite is an IMA-recognized mineral species in the arsenate class, with the chemical formula Na(Ca₀.₅Cu₀.₅)MgMg₂(AsO₄)₃.
It crystallizes in the monoclinic crystal system (space group C2/c). It is a member of the Alluaudite structural group.
Key properties: Vitreous luster; optically biaxial.
IMA symbol Nkn, IMA status: approved, named in 1992.
Found in a cavity in volcanic scoria.
It is found associated with Vanadinite, duhamelite.
The name refers to the village of Nickenich, Germany, nearby the Nickenicher Sattel volcano.