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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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.
Mineralization consists predominately of pitchblende or uraninite occurring as thin seams, bands and disseminations along bedding planes; tyuyamunite and cobalt bloom (erythrite) along some fractures; and to a lesser extent chalcopyrite, bornite, malachite, pyrite, annabergite and arsenides.
The Tynebottom mine has produced an interesting suite of nickel and cobalt-containing minerals including erythrite, safflorite, nickel-skullerudite, violarite, rammelsbergite, annabergite, and some very attractive specimens of drusy calcite and "flowstone" colored pink to deep magenta by micro-inclusions of erythrite, or blue by copper salts.
In 1988 Lindsay Greenbank led a group from the British Geological Survey through the mine, and found a small cavity in the roof that yielded what is certainly the finest known annabergite specimen from the Pennines (shown here).
Free-standing pseudooctahedral adamite crystals are rare and microscopically small; their typical associations are annabergite, conichalcite, powellite and talmessite.
Green crusts of annabergite have been recorded on the massive sulfides present in the mine (Petterd, 1910).
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.
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.