mineral

Iridescent chalcopyrite (“peacock ore”)

Chalcopyrite, CuFeS₂, commonly surface-oxidized to covellite and related copper sulfides

AI-generated identification · may be incorrect

Brassy metallic base with blue, purple, green, and gold tarnish; Mohs hardness 3.5–4, metallic luster, tetragonal crystal system, indistinct cleavage, and specific gravity about 4.1–4.3. The image appears to show a small rough, possibly polished or artificially enhanced specimen.

Identified September 16, 2026More mineral →

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Physical properties

Formation & geological history

Forms mainly in hydrothermal copper deposits, porphyry systems, and sulfide-rich veins, commonly alongside pyrite, bornite, and quartz. Deposits range from Precambrian to modern geological ages; the iridescence develops through surface oxidation or treatment.

Uses & applications

A major copper ore used for electrical wiring, alloys, and industry; attractive pieces are sold as inexpensive mineral specimens and ornaments, but it is not typically a gemstone.

Geological facts

“Peacock ore” is a trade name rather than a distinct mineral, and vivid colors are often produced by acid treatment. Natural chalcopyrite is usually brassy yellow and tarnishes readily.

Field identification & locations

Identify by metallic brass-yellow color, relatively low hardness, dense feel, and multicolored tarnish; it streaks dark greenish-black and is softer than pyrite. Common localities include Mexico, Peru, China, Cornwall, and Arizona.