Image: <bdi><a href="https://www.wikidata.org/wiki/Q56247090" class="extiw" title="d:Q56247090"><span title="mineral collector and dealer">Robert M. Lavinsky</span></a></bdi> (CC BY-SA 3.0)
orthorhombicuncommonSulfides
Chalcocite
Cu₂S
This specimen displays dark gray to black chalcocite with a metallic to sub-metallic luster, forming a somewhat blocky or massive aggregate.
Chalcocite Physical Properties
Mohs Hardness
2.5Crystal System
orthorhombicLuster
metallicStreak Color
grayish blackCleavage
indistinct on {110}Fracture
conchoidalSpecific Gravity
5.5Colors
dark gray, blackTransparency
opaqueType Locality
Tsumeb, Otjikoto (Oshikoto) Region, NamibiaMineral Group
SulfidesUses
copper oreAssociated Minerals
bornite, covellite, chalcopyrite, cuprite, azurite, malachite, native copperRarity
uncommonGeological Context
Chalcocite is a significant copper ore mineral, typically forming in the supergene enrichment zones of copper deposits where primary copper sulfides are altered, or as a primary mineral in hydrothermal veins.
