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)
orthorhombicuncommonSulfosalts
Enargite
Cu3AsS4
Enargite typically forms prismatic to tabular crystals, often striated, or massive aggregates. It exhibits a metallic luster and a dark, often grayish-black to violet-black color.
Enargite Physical Properties
Mohs Hardness
3Crystal System
orthorhombicLuster
metallicStreak Color
grayish-black to blackCleavage
perfect on {110}, distinct on {100} and {010}Fracture
unevenSpecific Gravity
4.45Colors
grayish-black, iron-black, violet-black, brownish-black, reddish-brownTransparency
opaqueType Locality
Leonard Mine, Butte, Butte District, Silver Bow County, Montana, USAMineral Group
SulfosaltsUses
minor copper ore, minor arsenic ore, collectorAssociated Minerals
pyrite, chalcopyrite, sphalerite, galena, bornite, tetrahedrite, tennantite, quartz, bariteRarity
uncommonGeological Context
Enargite is a hydrothermal mineral found in medium to high-temperature copper-arsenic sulfide deposits. It commonly occurs in veins associated with other sulfide minerals.
