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Bright Green Annabergite Pocket

The Mineral annabergite




Annabergite is a rare nickel mineral that can often has a bright green color. It is the end member of a series with Erythrite, with Annabergite being the nickel-dominant member and Erythrite being the cobalt-dominant member. Annabergite often contains some cobalt in its structure. The color caused by cobalt will dominate, and will cause some Annabergite to have a purplish color even if there is less cobalt than nickel present. Annabergite is named after the locality of Annaberg, Saxony, Germany, which is a type locality for this mineral.
Chemical Formula Ni3(AsO4)2 · 8(H2O)
Composition Hydrous nickel arsenate, often with some cobalt
Variable Formula (Ni,Co)3(AsO4)2 · 8(H2O)
Color Bright green, apple-green, purplish-green, beige, gray, grayish-pink.
Streak Light green
Hardness 1.5 - 2.5
Crystal System Monoclinic
Crystal Forms
and Aggregates
Never in large crystals; most often encrusting and in small botryoidal groups lining cavities. Also in groups of fragile radiating, acicular, or fibrous groupings, in rounded spiky balls, earthy, and massive. Individual microcrystals are thin and bladed, with a distinctly angled termination and usually with growth layers or striations.
Transparency Transparent to translucent
Specific Gravity 3.0 - 3.1
Luster Vitreous, pearly. Earthy specimens may be dull.
Cleavage 1,1
Fracture Splintery
Tenacity Slightly sectile and flexible
In Group Phosphates; Arsenates
Striking Features Color, crystal habits, and streak.
Environment As a secondary mineral that forms as an alteration product in the oxidation zone of nickel ore and cobalt sulfide deposits.
Rock Type Sedimentary, Metamorphic
Popularity (1-4) 3
Prevalence (1-3) 3
Demand (1-3) 2


Annabergite AUCTIONS
OTHER NAMES
Cabrerite Synonym of Annabergite. May also refer to the distinctly crystallized form that comes from Lavrion, Greece, or may refer to a magnesium-rich variety. Named after the Sierra Cabrera in Spain.
Nickel Bloom



USES
Annabergite is a minor ore of nickel in nickel deposits.

NOTEWORTHY LOCALITIES
Annabergite is not a common mineral. The only significant specimen locality of Annabergite is Lavrion, Greece, where it occurs in small bright-green, yet visible crystals. Other Annabergite localities include Cobalt, Timiskaming District, Ontario, Canada; and Cottonwood Canyon, Humboldt County, Nevada.

COMMON MINERAL ASSOCIATIONS
Limonite, Quartz, Nickeline, Skutterudite, Fluorite, Erythrite

DISTINGUISHING SIMILAR MINERALS
Due to the color, habits, and mode of occurrence of Annabergite, it is is not easily confused with other minerals.


annabergite PHOTOS
 
ADDITIONAL RESOURCES
 
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