
mineral
Copper-bearing sulfide ore, likely chalcopyrite with iron oxides
Chalcopyrite (CuFeS₂), possibly associated with bornite (Cu₅FeS₄), pyrite, and limonite/goethite
AI-generated identification · may be incorrectBrassy gray-gold metallic patches with iridescent blue-green tarnish and rusty brown oxidation; likely hardness 3.5–4 (chalcopyrite), metallic luster, massive/granular texture, no obvious cleavage, and specific gravity about 4.1–4.3.
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Physical properties
Brassy gray-gold metallic patches with iridescent blue-green tarnish and rusty brown oxidation; likely hardness 3.5–4 (chalcopyrite), metallic luster, massive/granular texture, no obvious cleavage, and specific gravity about 4.1–4.3.
Formation & geological history
Formed in hydrothermal veins or sulfide-rich igneous systems when copper-iron sulfide minerals crystallized from hot fluids; oxidation later produced the red-brown iron oxides and blue-green copper alteration. Exact age and locality cannot be determined from the photograph.
Uses & applications
Primarily an important copper ore; specimens with vivid iridescent tarnish are collected and sometimes sold as “peacock ore,” though artificially treated material is common.
Geological facts
The blue, purple, and green surface colors are thin tarnish films rather than the mineral’s true internal color. Copper sulfides can leave dark streaks and may develop bright green secondary minerals during weathering.
Field identification & locations
Look for metallic heft, brassy grains, rusty weathering, and blue-green tarnish; a streak test, hardness test, and chemical analysis distinguish it from similarly colored rocks. Common in copper districts worldwide, including Arizona, Montana, Peru, Chile, and Canada.
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