mineral

Likely native copper nugget

Native copper (Cu)

AI-generated identification · may be incorrect

The image shows a small, irregular reddish-brown metallic-looking piece, consistent with oxidized copper; hardness 2.5–3 Mohs, metallic luster when fresh, cubic crystal system, and no true cleavage. Photo detail is limited, so identification is provisional.

Identified October 2, 2026More mineral →

Explore Likely native copper nugget in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Native copper forms in hydrothermal veins and in altered volcanic or sedimentary rocks through copper-rich fluids and chemical reduction; deposits range from Precambrian to recent geological ages.

Uses & applications

Copper is widely used for electrical wiring, plumbing, roofing, alloys, and decorative objects; attractive native specimens are collected.

Geological facts

Copper develops red, brown, or green surface coatings as it oxidizes; fresh copper is salmon-red and can be drawn into wire.

Field identification & locations

Check for a heavy feel, malleability, and a reddish streak; common sources include Michigan’s Keweenaw Peninsula, Chile, and Australia. Confirm with a streak or conductivity test, since lighting can make other minerals appear coppery.