mineral

Native copper nugget

Copper (Cu), often with cuprite or copper-oxide surface

AI-generated identification · may be incorrect

Reddish-brown to copper-orange, metallic luster, irregular massive form, and malleable rather than brittle; Mohs hardness 2.5–3, specific gravity about 8.9. The apparent sparkle may reflect metallic grains or oxidation, though the image alone cannot confirm composition.

Identified September 21, 2026More mineral →

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Physical properties

Formation & geological history

Native copper forms in hydrothermal veins and cavities of basaltic volcanic rocks, commonly during Precambrian to younger mineralization. Oxidation can produce darker brown, red, or green surface coatings.

Uses & applications

Used primarily as a mineral specimen; copper itself is essential for electrical wiring, plumbing, alloys, and industrial equipment, but this small piece has negligible practical metal value.

Geological facts

Copper is one of the few naturally occurring metals with a distinctive red-orange color and can leave a copper-colored streak. It may develop green patina such as malachite over time.

Field identification & locations

Commonly found in Michigan’s Keweenaw Peninsula, Arizona, Chile, and other copper districts; test cautiously for metallic copper color, high heft, malleability, and conductivity. A definitive identification requires streak, conductivity, or chemical testing.