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Formula: (Cu,Ag)21As10
Arsenide
Crystal System: Monoclinic
Specific gravity: 6.7 measured, 8.01 calculated
Hardness: 3 to 3½
Streak: Black
Colour: Grey
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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