Enargite
Chemical Formula	Cu3AsS4
Species	Sulfides
Crystal System	Orthorhombic
Mohs Scale	3
Specific Gravity	4.4-4.5
Color	Grayish black to iron black; gray to pale pink-brown, deep red internal re?ections in polished section
Streak	Black
Luster	Metallic
Diaphaneity	Opaque
Cleavage	PerfectPerfect on , imperfect on and , indistinct .
Fracture	Irregular/Uneven
Crystal Habit：Tabular to prismatic crystals, striated parallel ; massive
Geological Setting：A mineral of moderate temperature vein and replacement deposits.