mineral

Native copper nugget

Native copper (Cu)

AI-generated identification · may be incorrect

Mohs hardness 2.5–3; copper-red to salmon metallic color, commonly tarnished or coated with green/black oxides. Metallic luster, cubic crystal structure, no distinct cleavage, and high specific gravity (~8.9).

Identified August 10, 2026More mineral →

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Physical properties

Formation & geological history

Formed when copper-rich hydrothermal fluids or weathering reactions precipitate elemental copper in fractures and cavities, often in basaltic volcanic rocks; specimens may range from ancient Precambrian deposits to younger supergene zones.

Uses & applications

Used primarily as copper ore for electrical wiring, plumbing, alloys, and industry; attractive natural nuggets are collected but are rarely used as gemstones.

Geological facts

The irregular, flattened form and strong copper-red color are characteristic, though the image alone cannot exclude copper-rich slag or another metallic mineral. Copper develops green patina through oxidation and carbonate formation.

Field identification & locations

Commonly found in Michigan’s Keweenaw Peninsula, Arizona, Chile, Australia, and parts of Canada. Confirm with a reddish metallic streak, softness, malleability, and high density; avoid scratching valuable specimens.