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Formula: NiAs2
Arsenide, paramorph of
pararammelsbergite and
rammelsbergite, probably a member of the
pyrite group. Krutovite
forms a complete solid solution series with gersdorffite
(AM 83.403).
Crystal System: Isometric
Specific gravity: 7.10 calculated
Hardness: 5½
Colour: Greyish white
Common impurities: Co,Fe,Cu,Sb,S
Environments
Krutovite occurs in copper -
nickel - arsenic veins of
hydrothermal origin
(Webmin, HOM).
Localities
At the Svornost mine, Jáchymov, Karlovy Vary District, Karlovy Vary Region, Czech Republic, krutovite
occurs in ore from the Geshiber vein, as grains, usually in close intergrowth with
nickelskutterudite, and also with
tennantite
(AM 62.174, HOM).
The type locality is Potůčky, Horní Blatná, Karlovy Vary District, Karlovy Vary Region, Czech Republic.
At Aksu, Stepnogorsk, Akmola Region, Kazakhstan, krutovite occurs in the
uranium - molybdenum deposit
in solid solution with gersdorffite
(AM 83.403).
At the Belorechensk deposit, Maykopsky District, Adygea, Russia, the deposit includes hydrothermal veins
cross-cutting Paleozoic (541-252 million years ago)
gneisses,
granites,
amphibolites, and
serpentinised
diaphorite.
The oxidation processes are poorly developed mostly in the upper part of the deposit. In the oxidised
parts of dolomite veins with
primary
uraninite,
nickeline, krutovite,
rammelsbergite,
gersdorffite or native arsenic,
the secondary minerals include
limonite, annabergite,
pharmacolite,
picropharmacolite,
hörnesite, rösslerite,
parasymplesite,
nováčekite, gypsum,
aragonite, arsenolite,
schröckingerite and
rabbittite.
In the oxidation zone of the
calcite-baryte veins with
primary galena,
sphalerite, chalcopyrite,
pyrite and marcasite, the
supergene minerals include
limonite, jarosite,
gypsum, melanterite,
brochantite, antlerite,
devilline, serpierite,
anglesite, malachite,
azurite, cerussite,
coronadite, hemimorphite
and native sulphur
(AM 100.336-337).
At the Khovu-Aksy Ni-Co deposit, Chedi-Kholsky District, Tuva, Russia, krutovite has been found with
nickeline, breithauptite,
löllingite,
nickelskutterudite,
rammelsbergite,
pararammelsbergite and
silver
(AM 62.174, HOM).
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