mineral

Tumbled peacock ore (likely chalcopyrite)

Chalcopyrite, CuFeS₂, commonly artificially oxidized to produce iridescent colors

AI-generated identification · may be incorrect

Brassy metallic sulfide with blue, purple, and magenta tarnish; Mohs hardness 3.5–4, metallic luster, poor cleavage, and specific gravity about 4.1–4.3. The rounded shape indicates tumbling or polishing.

Identified August 29, 2026More mineral →

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Physical properties

Formation & geological history

Chalcopyrite forms in hydrothermal copper deposits, porphyry systems, and massive sulfide ores, mostly in Precambrian to younger rocks. The vivid surface colors usually result from deliberate chemical treatment or accelerated oxidation rather than natural weathering.

Uses & applications

Primarily sold as a decorative or metaphysical specimen and occasionally collected as a copper ore; it has little practical value in this tumbled form. Untreated chalcopyrite is an important copper source.

Geological facts

“Peacock ore” is a trade name applied to iridescent chalcopyrite and sometimes bornite; visual identification alone cannot reliably distinguish them. It may leave a dark streak and can tarnish further with handling.

Field identification & locations

Common sources include Mexico, Peru, China, and the United States. Test cautiously because it is soft: a steel knife can scratch it, while its metallic luster and high density distinguish it from dyed glass or plastic.