Image: <bdi><a href="https://www.wikidata.org/wiki/Q56247090" class="extiw" title="d:Q56247090"><span title="mineral collector and dealer">Robert M. Lavinsky</span></a></bdi> (CC BY-SA 3.0)
monoclinicuncommonArsenates
Annabergite
Ni3(AsO4)2·8H2O
Annabergite typically forms as crusts, coatings, or radiating aggregates of small, often acicular or tabular crystals, exhibiting a distinctive apple-green to emerald-green color. The specimen shows a vibrant green coating on a matrix.
Annabergite Physical Properties
Mohs Hardness
1.5Crystal System
monoclinicLuster
vitreousStreak Color
pale green to greenish whiteCleavage
perfect on {100}Fracture
unevenSpecific Gravity
3.07Colors
apple green, emerald green, yellowish green, whiteTransparency
transparentType Locality
Lavrion (Laurion; Laurium), Lavrion District Mines, Lavrion (Laurion; Laurium) District, Attikí (Attica; Attika) Prefecture, GreeceMineral Group
ArsenatesUses
collectorAssociated Minerals
erythrite, nickel-bearing minerals, arsenopyriteRarity
uncommonGeological Context
Annabergite is a secondary mineral formed in the oxidized zones of nickel-bearing ore deposits, often as an alteration product of nickel arsenides. It is commonly found in association with other secondary arsenates.
