mineral
Chromite
Chromite (FeCr2O4)
Hardness: 5.5, Color: Black to brownish-black, Luster: Metallic to submetallic, Crystal Structure: Isometric (octahedral), Cleavage: None (uneven fracture), Specific Gravity: 4.5–4.8
- Hardness
- 5
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Physical properties
Hardness: 5.5, Color: Black to brownish-black, Luster: Metallic to submetallic, Crystal Structure: Isometric (octahedral), Cleavage: None (uneven fracture), Specific Gravity: 4.5–4.8
Formation & geological history
Found as a primary mineral in mafic and ultramafic igneous rocks (peridotites and serpentinites) via magmatic segregation. Frequently occurs in layered intrusions.
Uses & applications
Primary ore of chromium, used in making stainless steel, chrome plating, and high-temperature refractory materials.
Geological facts
Chromite is the only commercial source of chromium and is often associated with valuable metals like platinum. It is highly resistant to heat and corrosion.
Field identification & locations
Identified by its high density, black color, and slight magnetic property when heated. The Sicily region (Italy) contains various ultramafic outcrops where chromite and serpentine-group minerals occur.
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