mineral

Chromium (Chrome)

Chromium (Cr)

Hardness: 8.5 (Mohs scale), Color: Silvery-gray/Blue-white, Luster: Metallic, Crystal Structure: Body-centered cubic, Cleavage: None, Specific Gravity: 7.19

Hardness: 8

Identified March 16, 2026More mineral →

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Physical properties

Hardness: 8.5 (Mohs scale), Color: Silvery-gray/Blue-white, Luster: Metallic, Crystal Structure: Body-centered cubic, Cleavage: None, Specific Gravity: 7.19

Formation & geological history

Primary ore is Chromite (FeCr2O4). It is formed in ultramafic igneous rocks as a result of magmatic differentiation. Deposits range from the Precambrian era to more recent geological ages.

Uses & applications

Major industrial use in electroplating (chrome plating) for automotive parts (like the door handle pictured), stainless steel production, pigments, and dyes.

Geological facts

Chromium is the only element that can be polished to a mirror finish that is also highly resistant to corrosion. Its name comes from the Greek word 'chroma' meaning color, due to its many colorful compounds.

Field identification & locations

In a geological/industrial context, identification in the 'field' of manufacturing involves its high-shine, blue-tinted metallic reflection compared to the yellow-tinted reflection of nickel. It is commonly found globally in layered mafic intrusions (e.g., Bushveld Igneous Complex).