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Formula: Cu5As2
Arsenide
Crystal System: Hexagonal
Specific gravity: 8.48 measured, 8.437 calculated
Hardness: 3½
Streak: Black
Colour: Bluish white
Common impurities: Fe
Environments:
Koutekite occurs in arsenical copper deposits associated with
paxite, arsenic,
native silver, skutterudite,
nickeline, löllingite,
chalcocite, algodonite,
domeykite,
allargentum,
kutinaite and
calcite (HOM). It is replaced by
löllingite
(AM46.467).
At Černý Důl, Krkonoše Mountain, Czech Republic, koutekite occurs with
arsenic,
native silver,
skutterudite,
löllingite and
chalcocite
(AM43.794).
In Kazakhstan, koutekite occurs with domeykite,
löllingite, native silver
and nickeline in copper-mineralised
sandstone. Intergrowths
of koutekite with
domeykite and
löllingite occur. Koutekite often replaces
domeykite
(AM78.677).
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