annabergite


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annabergite

(ˈænəˌbɜːɡaɪt)
n
(Minerals) a rare green secondary mineral consisting of hydrated nickel arsenate in monoclinic crystalline form. Formula: Ni3(AsO4)2.8H2O. Also called: nickel bloom
[C19: named after Annaberg in Saxony, where it was discovered; see -ite1]
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Annabergite [Ni.sub.3][([AsO.sub.4]).sub.2]*8[H.sub.2]O
Most outstanding were a 350-gram specimen of Schneeberg silver, a fine cabinet-size skutterudite, fine annabergite, chloanthite, tetrahedrite, a perfect little proustite group from Chanarcillo, and a well-formed, pale copper-red nickeline group containing 3-inch pyramidal crystals from Saxony.
These include: annabergite, aragonite, argentopentlandite (Sirka, 1988), brochantite, chlorite (group), covellite, devilline, erythrite, gadolinite, gahnite, goethite, gold-silver (electrum), illite, kaolinite, langite, malachite, montmorillonite, natrojarosite, naumannite (Frigstad, 1972), palygorskite, posnjakite, scheelite, sepiolite (van der Wel, 1972), stilpnomelane, sulfur, tetrahedrite and tremolite-actinolite.
There is a paddleboard describing erythrite, annabergite and manganite as products of "mixed metals," but without any explanation of what that means, and I am not sure which metals are mixed in manganite.
Ernesto had about ten outstanding cabinet specimens, with brilliantly lustrous metallic white (think of skutterudite at its best) 5-mm octahedrons of gersdorffite in tight spherical groups, partly etched out of white vein calcite so that the gersdorffite balls sit up well on massive gray ore (with green stains of annabergite).
Oxidation in the dump has produced stains and efflorescences of erythrite, tyrolite, annabergite, malachite and, rarely, conichalcite and picropharmacolite.
Secondary nonmetallic minerals are: chlorargyrite, cholo-alite, keystoneite, mimetite, azurite, malachite, annabergite, calcite, goethite, hematite and numerous unidentified phases.
Somewhat better known are bright apple-green annabergite and cuprian adamite from Laurium, both occurring in glassy crusts of small crystals on matrix; spectacular specimens of these were here too.
Annabergite is the principal component of pale bluish green encrustations occasionally found on and in weathered material in the mine dumps.
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 Weathered metabasalt immediately adjacent to the gaspeite veins in the upper carbonate zone contains only thin (0.1-5 mm) coatings of lavendulan, gypsum and minor azurite along joint planes.
There were also annabergite from Laurium, Greece; kermesite from Pezinok, Slovakia; sphalerite from Banska Stiavnica (Schemnitz), Slovakia; chalcocite and olivenite from Cornwall, England; some top-class vanadinite specimens of recent vintage from Mibladen, Morocco; and a few dozen of the new mimetites from Badenweiler.