Chemical Formula: Cu3AsS4
Locality: Butte, Montana, USA.
Name Origin: From the Greek enarges – “obvious.”
Enargite is a copper arsenic sulfosalt mineral with formula: Cu3AsS4. It takes its name from the Greek word enarge, “distinct.” Enargite is a steel gray, blackish gray, to violet black mineral with metallic luster. It forms slender orthorhombic prisms as well as massive aggregates. It has a hardness of 3 and a specific gravity of 4.45.
Enargite is dimorph of the tetragonal luzonite.
Physical Properties
Cleavage: {110} Perfect, {100} Distinct, {010} Distinct
Color: Steel gray, Blackish gray, Violet black.
Density: 4.4 – 4.5, Average = 4.45
Diaphaneity: Opaque
Fracture: Uneven – Flat surfaces (not cleavage) fractured in an uneven pattern.
Hardness: 3 – Calcite
Luminescence: Non-fluorescent.
Luster: Metallic
Magnetism: Nonmagnetic
Streak: black
Photos
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