mineral

Native copper nugget

Copper (Cu), native element

AI-generated identification · may be incorrect

Reddish-orange, metallic to dull luster; hardness 2.5–3 Mohs, malleable, dense (specific gravity about 8.9), with no regular cleavage. The image is blurred, so identification is tentative; surface color strongly suggests copper rather than a rock.

Identified August 17, 2026More mineral →

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Physical properties

Formation & geological history

Forms when copper-rich hydrothermal fluids deposit native copper in fractures, cavities, and volcanic rocks, commonly in Precambrian to younger ore systems. Major occurrences include Michigan’s Keweenaw Peninsula, Arizona, Chile, and Australia.

Uses & applications

Historically used as copper ore and for tools, wiring, plumbing, alloys, and decorative specimens; attractive nuggets are collected but are generally not used as gemstones.

Geological facts

Native copper commonly develops irregular, branchlike, or rounded masses and can acquire green-blue oxidation coatings of malachite, azurite, or chrysocolla.

Field identification & locations

Check for a copper-red streak, very high heft, malleability, and electrical conductivity; avoid relying on color alone because copper-colored slag and bronze can look similar. Common localities include Michigan, Arizona, Cornwall, and the Ural Mountains.