Delafossite
Mineral CuFeO2
About it
Black, thin tabular crystals and botryoidal crusts with a metallic shine, in the oxidized zones of copper deposits. Classic from Bisbee, Arizona; named for French mineralogist Gabriel Delafosse.
- Type
- Mineral
- Group
- Oxide, delafossite group
- Formula
- CuFeO2
- Hardness (Mohs)
- 5.5
- Specific gravity
- 5.41
- Streak
- black
- Lustre
- metallic
- Crystal system
- Trigonal
- Colours
- black
- Transparency
- opaque
- Cleavage and fracture
- indistinct; conchoidal fracture
Typical values: real specimens vary. For more, see mindat.org.