Annabergite is an arsenate mineral consisting of a hydrous nickel arsenate, Ni3(AsO4)2·8H2O, crystallizing in the monoclinic system and isomorphous with vivianite and erythrite.
Formula: Ni3(AsO4)2·8H2O
System: Monoclinic
Colour: Green, light grey
From Lavrio; Greece
Photo Credit: László Tóth
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