mineral
Copper-bearing sulfide ore, possibly chalcopyrite-rich
Chalcopyrite (CuFeS₂), possibly with bornite and oxidation products
AI-generated identification · may be incorrectBrassy brown to coppery metallic appearance with tarnish and granular crystalline texture; chalcopyrite hardness 3.5–4, metallic luster, tetragonal structure, indistinct cleavage, and specific gravity about 4.1–4.3. Blue-green surface patches may indicate copper oxidation minerals such as covellite or chrysocolla.
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Physical properties
Brassy brown to coppery metallic appearance with tarnish and granular crystalline texture; chalcopyrite hardness 3.5–4, metallic luster, tetragonal structure, indistinct cleavage, and specific gravity about 4.1–4.3. Blue-green surface patches may indicate copper oxidation minerals such as covellite or chrysocolla.
Formation & geological history
Formed primarily in hydrothermal veins and porphyry copper deposits when hot, sulfur-rich fluids precipitated copper-iron sulfides, commonly during the Phanerozoic. The specimen’s weathered surface reflects later oxidation near the ground surface.
Uses & applications
Important copper ore for electrical wiring, plumbing, alloys, and industrial chemicals; attractive iridescent pieces are sold as mineral specimens, though this rough fragment has modest value.
Geological facts
Chalcopyrite is commonly called “peacock ore” when artificially or naturally tarnished with vivid blue, purple, and green colors. It is frequently confused with pyrite, but is softer and usually more copper-brassy.
Field identification & locations
Look for metallic brassy color, heavy feel, granular sulfide texture, and blue-green tarnish; a streak test is dark green-black, unlike pyrite’s black streak. Common localities include Chile, Peru, Mexico, Canada, and the United States.
