Nickenichite

nickenichite

vanadinite

duhamelite

alluaudite

Images

Formula: Na(Ca_0.5Cu_0.5)MgMg₂(AsO₄)3₃
Anhydrous normal arsenate, alluaudite group
Crystal System: Monoclinic
Specific gravity: 4.06 calculated
Hardness: 3
Colour: Bright blue to grey-blue
Luminescence: Not fluorescent under UV
Common impurities: K,Mn,P
Environments

Fumeroles

Localities

At the type locality, Nickenichite-bearing fumarole, Nickenicher Sattel, Nickenich, Pellenz, Mayen-Koblenz District, Rhineland-Palatinate, Germany, nickenichite occurs as bright blue fibrous to long prismatic monoclinic grains up to 0.20 mm long and 0.03 mm in diameter, in a cavity in volcanic scoria. Associated minerals include vanadinite and duhamelite (AM 79.571).

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