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Formula: Ni8.5(AsO4 )2As5+O8
Anhydrous arsenate of nickel
Crystal System: Trigonal
Specific gravity: 5.85 measured, 5.772 calculated
Hardness: 4
Streak: Pale green, pale blue-green
Colour: Dark grass-green, blue-green, pale brown
Environments
Aerugite is a rare secondary mineral in hydrothermal
nickel-arsenic-uranium ore deposits.
Associated minerals
include bismuth, bunsenite and
xanthiosite
(Mindat).
Localities
At the type locality, Johanngeorgenstadt, Erzgebirgskreis, Saxony, Germany, aerugite forms fine-grained
masses and crystalline crusts occurring in an oxidised uranium-bearing
vein in a nickel-arsenic deposit,
as part of a distinctive assemblage with bismuth,
bunsenite, xanthiosite,
orange-brown to deep-golden-brown paganoite and
rooseveltite
(MinRec 55.5.587, HOM).
Petewilliamsite is another mineral associated with aerugite
at this locality, where it forms dark violet-red to dark brownish red aggregates of millimetric size
(AM 90.273).
Aerugite from Johanngeorgenstadt -
Image
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