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Formula: Ni3(AsO4)2.8H2O
Hydrated arsenate,
vivianite group,
nickel-bearing mineral, forms a series with
erythrite
Crystal System: Monoclinic
Specific gravity: 3.07 measured, 3.146 calculated
Hardness: 1½ to 2½
Streak: Pale green to white (paler than the mineral color).
Colour: Green, light grey to light apple green, white; pale rose red when rich in
cobalt.
Common impurities: Co,Mg,Ca,Zn,Fe
Environments:
Annabergite is an uncommon supergene alteration product
which forms during
the weathering of primary
nickel and
arsenic-bearing minerals.
It is generally found in the oxidised zones of polymetallic hydrothermal mineral veins. Associated minerals include
gersdorffite,
maucherite, nickeline,
nickelskutterudite and
retgersite
(R&M 85.2.154, Mindat, HOM).
At the Union Jack mine, Coolgardie, Western Australia, annabergite has been found as crystals on
quartz and also as a chalky coating on vein
quartz
(AJM 19.2.43-45).
Annabergite from the Union Jack Mine -
Image
In the West mine at Tilt Cove, Newfoundland, Canada, annabergite occurs with
maucherite, nickeline,
nickelskutterudite,
gersdorffite,
violarite, rammelsbergite and
arsenopyrite
(R&M 85.2.154-159).
At the Clara Mine, Oberwolfach, Ortenaukreis, Freiburg Region, Baden-Württemberg, Germany, annabergite has
been found with bayldonite (Mindat photo).
Annabergite from the Clara Mine - Image
At the type locality, the Kippenhain Mine, Erzgebirge, Saxony, Germany, annabergite occurs in the
oxide zone in a nickel-bearing sulphide deposit, associated with
fluorite
(Mindat).
Annabergite from the Kippenhain Mine -
Image
At the Gloria mine, Sinaloa, Mexico, annabergite is associated with
gersdorffite
(R&M 85.2.154-159).
At Bou Azzer, Morocco, annabergite occurs in a dolomitic
cavity zone with nickeline,
rammelsbergite
and gersdorffite
(MinRec 38.5.359).
At Aït Ahmane, Bou Azzer, Morocco, annabergite occurs as crystals in
quartz with nickel silicates and
talmessite, and in a separate occurrence associated with
erythrite
(MinRec 38.5.359).
Annabergite from Aït Ahmane - Image
At Ightem, Bou Azzer, Morocco, annabergite occurs with adamite
and powellite
(MinRec 38.5.359).
At the Hilton mine, Cumbria, England, UK, annabergite has been found with
fluorite and iron oxides
(R&M 84.2.114-121).
Annabergite from the Hilton Mine -
Image
At the Great Orme Copper Mines, Llandudno, Gwynedd, Wales, UK, annabergite forms microscopic coatings on
gersdorffite
(MW).
At the cobalt mine dumps below Great Hill, Connecticut, USA,
annabergite has been found with
erythrite as encrustations on
nickelskutterudite
(R&M 85.2.154-159).
At the Bishop Silver and Cobalt Mining Company property in Inyo county, California, USA,
annabergite occurs with erythrite,
cobalt arsenides and
acanthite
(R&M 85.2.154-159).
At the Kelsey mine, Los Angeles county, California, USA, annabergite occurs with
erythrite, cobalt arsenides and
native silver
(R&M 85.2.154-159).
At the Lovelock mine, Humbolt county, Nevada, USA, annabergite occurs with
retgersite and
erythrite
(Dana, R&M 85.2.154-159).
Annabergite from the Lovelock Mine -
Image
At the Johnson and Candelaria mines, Mineral county, Nevada, USA, annabergite is associated
with conichalcite and
olivenite
(R&M 85.2.154-159).
Annabergite from the Candelaria Silver Mine -
Image
At the Alhambra and Black Hawk mines and the Granada prospect at Grant Ccounty, New Mexico, USA,
annabergite occurs sparingly with erythrite
(R&M 85.2.154-159).
Annabergite from Grant County -
Image
In prospects near Nespelem, Okanogan county, Washington, USA, annabergite occurs with other
nickel minerals and erythrite
(R&M 85.2.154-159).
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