Erythrite
>
Erythrite or red cobalt is a secondary hydrated cobalt arsenate mineral with the formula Co
₃
₂•8H
₂O. Erythrite and annabergite, chemical formula Ni
₃
₂•8H
₂O, or nickel arsenate form a complete series with the general formula
₃
₂•8H
₂O.... Wikipedia
Cleavage: Perfect on; poor on, and
Color: Crimson to peach-red, pale rose, or pink, may be zoned
Crystal class: Prismatic (2/m); (same H-M symbol)
Crystal habit: Radial or stellate aggregates, fibrous, drusy; usually powdery and massive – rarely as striated prismatic crystals
Crystal system: Monoclinic
Formula (repeating unit): Co3(AsO4)2·8H2O
Luster: Subadamantine, pearly on cleavages
Show more
Show less