Anhydrous normal arsenate, alluaudite group
Specific gravity: 4.06 calculated
Colour: Bright blue to grey-blue
Luminescence: Not fluorescent under UV
Common impurities: K,Mn,P
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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