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Formula: CuSe2
Selenide, pyrite group,
paramorph of petříčekite,
forms a series with trogtalite
Crystal System: Isometric
Specific gravity: 6.53 calculated
Hardness: 4
Streak: Dark grey
Colour: Grey
Common impurities: Co,Ni,Fe,Hg
Environments
Krut'aite is of hydrothermal origin. Associated minerals include
clausthalite, eskebornite,
uraninite, hematite,
ferroselite, bukovite,
umangite, berzelianite,
chalcopyrite and goethite
(HOM).
Localities
At the type locality, Petrovice, Nové Město na Moravě, Žďár nad Sázavou District, Vysočina Region, Czech Republic,
krut'aite occurs as crystals up to a few tenths of a mm in size, associated with
berzelianite, umangite,
clausthalite, klockmannite,
eskebornite, ferroselite,
pitchblende and hematite, in
dolomite-calcite
gangue
(AM 59.210).
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