mineral

Unknown metallic sulfide-bearing rock, possibly chalcopyrite or bornite

Tentative: chalcopyrite (CuFeS₂) or bornite (Cu₅FeS₄)

AI-generated identification · may be incorrect

Small, irregular specimen with a brassy bronze-to-purple metallic luster and granular texture; likely Mohs hardness 3–4, opaque, with poor or indistinct cleavage. The iridescent tarnish is characteristic of copper sulfides, though the image is insufficient for certain identification.

Identified August 19, 2026More mineral →

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Physical properties

Formation & geological history

Copper sulfides form in hydrothermal veins and disseminated ore deposits, commonly associated with quartz, pyrite, and other sulfides. Their ages range from ancient Precambrian deposits to younger volcanic and magmatic systems.

Uses & applications

Important copper ores used for electrical wiring, plumbing, alloys, and industrial manufacturing; attractive iridescent pieces are collected as mineral specimens.

Geological facts

Bornite is popularly called “peacock ore,” while artificially treated chalcopyrite is also widely sold under that name. A metallic streak, density, and chemical testing help distinguish them.

Field identification & locations

Common in copper districts worldwide, including Arizona, Montana, Chile, Peru, Mexico, and Cornwall. Test streak on unglazed porcelain, avoid prolonged skin contact with unknown sulfides, and use hardness or specific-gravity tests.