mineral

Blue-green peacock chalcopyrite

Chalcopyrite, CuFeS₂, artificially oxidized/iridescent-coated

AI-generated identification · may be incorrect

Brassy metallic sulfide with vivid blue, turquoise, purple, and green tarnish; Mohs hardness 3.5–4, brittle, opaque, poor cleavage, tetragonal crystal structure, and specific gravity about 4.1–4.3. The specimen appears rough and likely coated or heat-treated rather than naturally iridescent.

Identified September 17, 2026More mineral →

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Physical properties

Formation & geological history

Chalcopyrite forms in hydrothermal copper deposits, porphyry systems, and some massive sulfide ores, commonly alongside pyrite and bornite. Its geological ages vary widely; the intense “peacock” colors generally result from surface oxidation or artificial treatment.

Uses & applications

An important copper ore and a popular inexpensive mineral-collection, lapidary, and décor specimen; it is not typically used as a gemstone because of low hardness and brittleness.

Geological facts

Natural chalcopyrite is usually metallic brass-yellow; vivid peacock colors are commonly produced by acid treatment or heating. It may leave a dark greenish-black streak and can tarnish further with handling.

Field identification & locations

Identify it by metallic luster, relatively soft brittle texture, high density, and copper-brass base beneath the blue coating; it should not scratch glass reliably. Common sources include Peru, Mexico, China, and the United States.