mineral

Chromite

Chromite (FeCr2O4)

AI-generated identification · may be incorrect

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

Identified July 5, 2026More mineral →

Explore Chromite in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

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.