Chromite
Mineral FeCr2O4
About it
Black granular masses and grains with a brown streak and weak magnetism, found in serpentinite and other ultramafic rocks. The only ore of chromium; vast layers lie in the Bushveld Complex of South Africa.
- Type
- Mineral
- Group
- Oxide, spinel group
- Formula
- FeCr2O4
- Hardness (Mohs)
- 5.5
- Specific gravity
- 4.5–4.8
- Streak
- brown
- Lustre
- metallic, submetallic
- Crystal system
- Isometric (cubic)
- Colours
- black, brownish black
- Transparency
- opaque
- Cleavage and fracture
- none; uneven fracture
- Magnetic
- Weakly
Typical values: real specimens vary. For more, see mindat.org.