mineral

Copper-bearing sulfide ore, possibly bornite/chalcopyrite

Likely bornite (Cu5FeS4) and/or chalcopyrite (CuFeS2) in a sulfide-rich host rock

AI-generated identification · may be incorrect

Brassy metallic to iridescent blue-purple and coppery surfaces suggest tarnished copper sulfides; hardness about 3–4 Mohs, opaque, with uneven fracture and high specific gravity. Identification is provisional from the photograph.

Identified September 20, 2026More mineral →

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At a glance

Common name: Copper-bearing sulfide ore, possibly bornite/chalcopyrite
Scientific name: Likely bornite (Cu5FeS4) and/or chalcopyrite (CuFeS2) in a sulfide-rich host rock
Category: mineral
Identified: September 20, 2026
Method: Standard

AI Estimated Value

About $5–$25 for a common rough specimen; $25–$100+ if strongly iridescent, locality-labeled, or unusually attractive.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Forms in hydrothermal veins and magmatic-hydrothermal ore deposits when hot, sulfur-rich fluids precipitate copper and iron sulfides; commonly associated with quartz, pyrite, and altered igneous rocks. Ages vary widely by deposit.

Uses & applications

Important copper ore for electrical wiring, plumbing, alloys, and industrial equipment; attractive iridescent pieces are collected, though this specimen appears rough and low grade.

Geological facts

Bornite is nicknamed “peacock ore” after oxidation produces vivid blue, purple, and green tarnish. Fresh bornite is typically copper-red to bronze, while chalcopyrite is brassy yellow.

Field identification & locations

Look for metallic luster, unusual heft, brassy or coppery color, and blue-purple tarnish; a streak, hardness, and chemical test or X-ray diffraction are needed for confirmation. Common localities include Arizona, Montana, Peru, Chile, and Cornwall.