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Formula: Pb(Ni,Fe3+)2(AsO4)2(H2O,OH)2
Arsenate,
tsumcorite group, forms a solid-solution series with
nickellotharmeyerite
Crystal System: Monoclinic
Specific gravity: 5.02 calculated
Hardness: 4
Streak: Yellow
Colour: Yellow, brownish yellow, light brown or brown
Common impurities: Ca
Environments
Localities
At the type locality, Km 3 open pit, Km 3 mines, Km 3, Lavrion Mining District, Lavreotiki, East Attica,
Attica, Greece, nickeltsumcorite was found in the oxidation zone of a hydrothermal orebody containing
gersdorffite and galena.
It is associated with annabergite,
nickellotharmeyerite,
nickelaustinite,
gaspéite, calcite,
dolomite, aragonite,
quartz, goethite,
cerussite,
arseniosiderite,
mimetite,
oxyplumboroméite and
manganese oxides and hydroxides. Nickeltsumcorite occurs as
open-work aggregates and interrupted crusts up to 3 mm × 5 mm in area and up to 0.2 mm thick. They typically
consist of coarse radial spherulites or dense concentric nodules up to 0.15 mm in diameter. Bunches or
hemispherical clusters of crude individuals and separate imperfect, elongated crystals (up to 0.02 mm long)
are also observed
(MM 80.337-346).
Nickeltsumcorite from the Km 3 Open Pit -
Image
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