mineral

Peacock ore (iridescent chalcopyrite)

Chalcopyrite, CuFeS₂, commonly surface-treated to enhance iridescence

AI-generated identification · may be incorrect

Brassy metallic sulfide with vivid purple, blue, pink, and gold tarnish; Mohs hardness 3.5–4, poor cleavage, uneven fracture, tetragonal crystal structure, and specific gravity about 4.1–4.3. The rainbow colors are an oxidation film, often artificially intensified with acid or heat.

Identified August 13, 2026More mineral →

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Physical properties

Formation & geological history

Forms mainly in hydrothermal copper deposits, commonly with pyrite, bornite, quartz, and sphalerite; most specimens formed during Paleozoic to Mesozoic ore-forming events, though deposits range widely in age.

Uses & applications

Collected as a colorful mineral specimen and occasionally used as a copper ore; it is generally too soft and unstable for durable jewelry.

Geological facts

“Peacock ore” is a trade name, not a distinct mineral; naturally iridescent chalcopyrite is often confused with bornite, which is harder and commonly more copper-rich.

Field identification & locations

Identify by metallic luster, brassy base color, rainbow tarnish, softness, and possible green-black streak; common localities include Mexico, Peru, the United States, China, and Australia.