mineral
Peacock ore
Iridescent chalcopyrite, commonly marketed as bornite
AI-generated identification · may be incorrectMetallic luster with vivid purple, blue, and gold tarnish; typically massive and granular, with Mohs hardness about 3.5–4 and specific gravity around 4.1–4.3. The bright colors are an oxidation film, not the mineral’s natural color.
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Physical properties
Metallic luster with vivid purple, blue, and gold tarnish; typically massive and granular, with Mohs hardness about 3.5–4 and specific gravity around 4.1–4.3. The bright colors are an oxidation film, not the mineral’s natural color.
Formation & geological history
Usually formed in hydrothermal copper-ore veins and replacement deposits, commonly during the Paleozoic to Mesozoic and younger geological events. Most commercial specimens come from copper mines in Mexico, Peru, China, and the United States.
Uses & applications
Primarily a decorative and collector specimen; it has little practical value after polishing or treatment. Untreated chalcopyrite is an important copper ore, but this small iridescent piece is not normally used industrially.
Geological facts
“Peacock ore” is a trade name and is often artificially acid-treated to intensify its colors. Bornite (Cu5FeS4) naturally tarnishes strongly, while chalcopyrite (CuFeS2) is frequently sold under the same name.
Field identification & locations
Identify it by metallic glitter, unusually vivid surface colors, softness, and copper-sulfide appearance; a streak test is typically dark greenish-black. The image cannot reliably distinguish bornite from treated chalcopyrite.
