annabergite

noun

1. a mineral, hydrous nickel arsenate, Ni3As2O8⋅8H2O, occurring in apple-green masses and isomorphous with erythrite.

noun

1. a rare green secondary mineral consisting of hydrated nickel arsenate in monoclinic crystalline form. Formula: Ni 3 (AsO 4) 2 .8H 2 OAlso called: nickel bloom