Formula: (Cu,Ag)21As10
Specific gravity: 6.7
Hardness: 3 to 3½
Streak: Black
Colour: Grey

Hydrothermal environments

Novákite alters easily to secondary minerals (AM 44.1321).

At the type locality, Černý Důl, Krkonoše Mountain, Hradec Králové Region, Czech Republic, novákite occurs as granular aggregates in hydrothermal carbonate veins cutting diopside hornfels lenses in pyroxene gneiss and less commonly in mica schist. It is found most frequently intergrown with native arsenic; other associated minerals include arsenolamprite, koutekite, silver, löllingite, chalcocite, skutterudite, chalcopyrite, bornite, uraninite and calcite (HOM, Mindat, AM 46.885-891).

At the Cashin mine, Montrose county, Colorado, USA, novákite is associated with algodonite, koutekite, djurleite and domeykite (HOM).

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