mineral

Copper ore (cupriferous rock)

Native copper with copper oxides, likely cuprite (Cu₂O) and malachite/azurite alteration

AI-generated identification · may be incorrect

Metallic reddish-orange patches with dark brown to green-black oxidized areas; native copper is Mohs 2.5–3, opaque, highly metallic, and very dense (specific gravity about 8.9). The specimen appears massive rather than well crystallized, with irregular fracture and possible earthy oxidation coatings.

Identified September 15, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed in a hydrothermal copper-deposit environment, where native copper and sulfide minerals were later altered near the surface by oxygenated groundwater. Exact geological age and locality cannot be determined from the photograph.

Uses & applications

Copper ore is mined for electrical wiring, plumbing, alloys, and industrial equipment; attractive native-copper specimens are collected. This rough piece has limited jewelry use unless cut or stabilized.

Geological facts

The distinctive salmon-red metallic color strongly suggests native copper, while black-brown crusts may represent oxidized copper minerals or associated sulfides. A freshly scratched surface may reveal brighter copper color.

Field identification & locations

Common sources include Michigan’s Keweenaw Peninsula, Arizona, Chile, and Zambia. Confirm with a reddish metallic streak, high density, malleability, and an acid test performed cautiously by an expert; visual identification alone is not definitive.