Enargite
Mineral Cu3AsS4
Take care.
- Contains arsenic: Wash your hands after handling it, don't make dust, and never heat it.
About it
Grey-black striated prisms and blades with a perfect cleavage, an arsenic-bearing copper ore. Famous from Butte, Montana, Quiruvilca, Peru, and Bor, Serbia.
- Type
- Mineral
- Group
- Sulfosalt
- Formula
- Cu3AsS4
- Hardness (Mohs)
- 3
- Specific gravity
- 4.4–4.5
- Streak
- greyish black
- Lustre
- metallic
- Crystal system
- Orthorhombic
- Colours
- greyish black, iron black
- Transparency
- opaque
- Cleavage and fracture
- perfect prismatic; uneven fracture
Typical values: real specimens vary. For more, see mindat.org.