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Formula: Cu5.2Se6
Selenide
Crystal System: Hexagonal
Specific gravity: 5.99 measured, 6.12 calculated
Hardness: 2 to 2½
Streak: Grey to black
Colour: Grey-black to black, may tarnish to blue-black
Common impurities: Ag
Environments
Klockmannite is of hydrothermal origin, in deposits rich in copper and
tellurium. Associated minerals include
clausthalite, umangite,
eucairite, berzelianite,
crookesite, chalcomenite,
azurite, chalcocite,
cobaltomenite, covellite,
crookesite, goethite,
kru'taite, malachite,
penroseite, pyrite and
tellurite
(HOM, Mindat).
Localities
At the type locality, the Las Asperezas mine, Sierra de Cacho, Villa Castelli, General Lamadrid department, La Rioja
Province, Argentina, klockmannite is found as granular aggregates in
calcite associated with umangite,
clausthalite, eucairite,
crookesite, chalcomenite and
berzelianite, often strongly altered to
malachite and chalcomenite
(AM 14.41, Mindat).
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