annabergite


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annabergite

[′a·nə‚bər‚gīt]
(mineralogy)
(Ni,Co)3(AsO4)2·8H2O A monoclinic mineral usually found as apple-green incrustations as an alteration product of nickel arsenides; it is isomorphous with erythrite. Also known as nickel bloom; nickel ocher.
References in periodicals archive ?
Associations include erythrite, annabergite, talmes-site, powellite, galena and native gold.
The best reported Bou Azzer annabergite specimens (Clavel and Elmaleh-Levy, 1978) are those found in an ore vein (designated as the Filon Nickeline--"Nickeline Vein") in the western part of the district, 6 km west-northwest of Bou Azzer.
In Vein 51, Ait Ahmane, annabergite formed by the hydrothermal alteration of gersdorffite has been found as beautiful green leafy crystals in quartz, with massive "garnierite" and pale green, microcrystalline, nickel-rich talmessite.
Specimens of chromite rich in secondary species, especially talmessite and annabergite, and also containing chromite grains, from Ait Ahmane.
The mineral also appears near grains of copper sulfide and as chrysocolla pseudomorphs; associated species include conichalcite, lavendulan, annabergite and erythrite.
The most attractive specimens, from Vein 52, show color-zoned mixed crystals, with green lower zones of annabergite and pale pink edges and tips of erythrite.
Close examination of samples from Tamdrost-West reveals visible gold, as tiny grains in earthy, beige-colored material, associated with annabergite and with uranium minerals (novacekite and zeunerite).
Mining in Vein 59, Ait Ahmane, in 2001-2002 produced a small dump with a rich mineral assemblage: nickel-rich talmessite, cobaltkoritnigite, vladimirite, annabergite, and small, green, attractive crystals of nickelaustinite, in some cases with talmessite, opal, or flakes of guerinite (?
Native Elements Halides, Oxides & Hydroxides Awaruite Atacamite * Unnamed Bi-Ni-Fe-Pt alloy + Brucite * Unnamed Au-Cu alloy + Magnetite Theophrastite Sulfides Covellite * Arsenates, Sulfates Digenite * Annabergite + Heazlewoodite Retgersite * Millerite Unnamed nickel iron sulphate + Molybdenite * Pentlandite Polydymite * Carbonates Pyrite + Dypingite * Pyrrhotite * Gaspeite * Violarite + Hellyerite Magnesite + Otwayite + Pyroaurite * Reevesite * Zaratite Native Elements Silicates Awaruite Andradite Unnamed Bi-Ni-Fe-Pt alloy + Antigorite Unnamed Au-Cu alloy + Chrysotile Clinochlore Sulfides Diopside * Covellite * Enstatite + Digneite * Glossular + Heazlewoodite Lizardite Millerite Opal Molybdenite * Palygorskite * Pentlandite Pecoraite * Polydymite * Stevensite (or Saponite?
Massive to radial aggregates of black, metallic cryptomelane have been found at the 3-km point along the old Laurium-Kamareza road, associated with annabergite and magnesian calcite.
Carbonate Zone Minor Phases Rare Phases Upper paratacamite, carrboydite, kambaldaite, annabergite, glaukosphaerite, azurite, lavendulan, hydrohonessite, retgersite, nepouite, nullaginite, pyrolusite, huntite, olivenite, otwayite, aragonite, calcite, pecoraite pharmacosiderite, [+ or -] dolomite reevesite, takovite, widgiemoolthalite Lower paratacamite, dolomite, kambaldaite huntite
Annabergite is a relatively rare mineral, occurring in open fractures mainly as clusters of transparent, pale green to bluish green and bright green prismatic crystals up to about 5 mm in length.