mineral

Chromite

Chromite (FeCr2O4)

Hardness: 5.5 on Mohs scale; Color: Black, brownish-black; Luster: Submetallic to metallic; Crystal System: Isometric (octahedral); Cleavage: None; Streak: Brown.

Hardness: 5
Color: Black, brownish-black
Luster: Submetallic to metallic

Identified July 5, 2026More mineral →

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Physical properties

Hardness: 5.5 on Mohs scale; Color: Black, brownish-black; Luster: Submetallic to metallic; Crystal System: Isometric (octahedral); Cleavage: None; Streak: Brown.

Formation & geological history

Formed as a primary mineral in mafic and ultramafic igneous rocks through magmatic segregation. Often found in layered intrusions (like the Bushveld Complex) or peridotites.

Uses & applications

Primary ore of chromium, used for stainless steel production, chrome plating, and fire-resistant bricks (refractories).

Geological facts

Chromite is part of the spinel group. It is the only economic source of chromium and is highly resistant to heat, making it essential for aerospace and defense industries.

Field identification & locations

Identified by its high specific gravity, brown streak, and sometimes weak magnetism. Found in heavy mineral sands or weathered ultramafic outcrops. The location (Sicily, Italy) is consistent with the region's presence of volcanic and mafic rocks.