mineral

Peacock ore

Iridescent chalcopyrite, commonly bornite-coated or artificially treated copper sulfide

AI-generated identification · may be incorrect

Brassy metallic to purple, blue, and gold iridescence; Mohs hardness about 3.5–4, opaque, metallic luster, poor cleavage, and specific gravity around 4.1–4.3. The vivid colors commonly result from surface tarnish or heat/chemical treatment rather than crystal structure.

Identified September 19, 2026More mineral →

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Physical properties

Formation & geological history

Chalcopyrite (CuFeS₂) forms in hydrothermal copper deposits, often with bornite (Cu₅FeS₄), over geologic timescales from the Precambrian onward. Commercial “peacock ore” is frequently acid-treated to enhance the tarnish colors.

Uses & applications

Primarily sold as a decorative mineral and collectible; chalcopyrite is an important copper ore, though this colorful material is generally not used industrially. Specimens may be polished, coated, or stabilized for display.

Geological facts

The specimen’s rough, glittering, multicolored metallic surface strongly matches peacock ore. Natural tarnish can be blue-purple, while uniformly intense rainbow colors often indicate treatment.

Field identification & locations

Identify it by metallic weight, opaque brassy base, iridescent tarnish, and softness relative to quartz; it may leave a dark streak and tarnish further. Common sources include Mexico, Peru, China, and the United States.