mineral

Chalcopyrite

Chalcopyrite (CuFeS2)

AI-generated identification · may be incorrect

Hardness: 3.5-4.0 Mohs; Color: Brass yellow to golden; Luster: Metallic; Crystal structure: Tetragonal; Cleavage: Indistinct; Specific Gravity: 4.1-4.3

Hardness: 3
Color: Brass yellow to golden
Luster: Metallic

Identified April 6, 2026More mineral →

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Physical properties

Hardness: 3.5-4.0 Mohs; Color: Brass yellow to golden; Luster: Metallic; Crystal structure: Tetragonal; Cleavage: Indistinct; Specific Gravity: 4.1-4.3

Formation & geological history

Forms in hydrothermal veins, contact metamorphic deposits, and as an accessory mineral in igneous rocks via magmatic segregation. Found throughout various geological ages.

Uses & applications

Primary ore of copper used in electronics, construction, and plumbing; also a popular mineral for collectors.

Geological facts

Often confused with gold or pyrite, earnining it the nickname 'Fool's Gold,' though it is yellower and softer than pyrite. It can develop a colorful iridescent tarnish called 'Peacock Ore' when treated.

Field identification & locations

Identify by its brassy color, greenish-black streak, and brittle tenacity. Commonly found in major mining districts like those in Chile, Canada, and the USA.