mineral

Copper ore, likely native copper in a host rock

Native copper (Cu), possibly with cuprite/iron-oxide matrix

AI-generated identification · may be incorrect

Metallic coppery-bronze color with dull brown oxidation; metallic to earthy luster and irregular fracture. Native copper has Mohs hardness 2.5–3, cubic crystal structure, no cleavage, and specific gravity about 8.9; the image is too low-resolution for certainty.

Identified August 14, 2026More mineral →

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Physical properties

Formation & geological history

Forms in hydrothermal veins and oxidized zones of copper deposits, commonly replacing minerals in basalt or sedimentary rocks. Deposits range from Precambrian to recent geological ages.

Uses & applications

Copper is essential for electrical wiring, plumbing, alloys, and industry; attractive native-copper specimens are collected but are not typically used as gemstones.

Geological facts

Fresh native copper is bright reddish-orange but commonly develops brown, black, or green oxidation coatings. It is malleable and leaves a copper-red streak, unlike most brown host minerals.

Field identification & locations

Field identification requires a copper-red streak, high density, metallic appearance, and malleability; avoid confusing it with bronze-colored sulfides such as chalcopyrite. Common localities include Michigan, Arizona, Montana, Chile, and Australia.