Selenide, pyrite group, paramorph of petříčekite, forms a series with trogtalite
Streak: Dark grey
Common impurities: Co,Ni,Fe,Hg
Krut'aite is of hydrothermal origin. Associated minerals include
chalcopyrite and goethite
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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