Is Annabergite a mineral or rock?
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. Crystals are minute and capillary and rarely met with, the mineral occurring usually as soft earthy masses and encrustations.
Why is Annabergite called nickel bloom?
Annabergite has been called “Nickel Bloom” by miners referring to its bright crystals that are green. Likewise, Erythrite is often called “Cobalt Bloom” for the bright crystals being reddish-purple.
