Djurleite
Mineral Cu31S16
About it
Black copper sulfide very like chalcocite, often part of what is sold as chalcocite; crystals are uncommon. Named for Seved Djurle; found in many copper mines, including Bisbee, Arizona.
- Type
- Mineral
- Group
- Sulfide, chalcocite group
- Formula
- Cu31S16
- Hardness (Mohs)
- 2.5–3
- Specific gravity
- 5.6–5.8
- Streak
- black
- Lustre
- submetallic, metallic
- Crystal system
- Monoclinic
- Colours
- black, dark lead grey
- Transparency
- opaque
- Cleavage and fracture
- indistinct; conchoidal fracture
Typical values: real specimens vary. For more, see mindat.org.