mineral
Native copper-bearing rock (probable copper ore)
Native copper (Cu), likely with cuprite (Cu₂O), malachite (Cu₂CO₃(OH)₂), and iron-oxide matrix
AI-generated identification · may be incorrectMetallic copper-red and green surface, locally earthy to submetallic luster; native copper is Mohs 2.5–3 and very dense (specific gravity ~8.9), while associated oxides are softer. The irregular, massive texture shows no obvious cleavage or crystal form.
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Physical properties
Metallic copper-red and green surface, locally earthy to submetallic luster; native copper is Mohs 2.5–3 and very dense (specific gravity ~8.9), while associated oxides are softer. The irregular, massive texture shows no obvious cleavage or crystal form.
Formation & geological history
Forms when copper-rich hydrothermal fluids precipitate native copper and secondary oxidation minerals in volcanic or sedimentary host rocks. The specimen’s age depends on its deposit, commonly Paleozoic to Cenozoic.
Uses & applications
Copper ore is smelted for electrical wire, plumbing, alloys, and industrial equipment; attractive pieces are sold as mineral specimens. Malachite-rich material may also be cut for cabochons and ornamental objects.
Geological facts
The vivid copper-red metallic areas are diagnostic of native copper, while green coatings commonly indicate malachite; reddish-brown zones may be cuprite or iron oxides.
Field identification & locations
Look for unusually high density, malleable metallic copper grains, green efflorescent coatings, and a copper-red streak; avoid relying on color alone because bronze-colored slag can look similar. Common localities include Michigan, Arizona, Chile, Russia, and the Democratic Republic of the Congo.
