mineral

Copper

Native Copper (Cu)

Hardness: 2.5-3; Color: Reddish-orange/copper-red; Luster: Metallic; Crystal Structure: Isometric (Face-centered cubic); Cleavage: None; Specific Gravity: 8.94. This specimen is a .999 fine refined bullion bar.

Hardness: 2
Color: Reddish-orange/copper-red
Luster: Metallic

Identified July 6, 2026More mineral →

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Physical properties

Formation & geological history

Native copper forms in basaltic lavas, hydrothermal veins, and the oxidation zones of sulfide deposits. It can be billions of years old or relatively recent depending on the deposit. This specific bar is industrially refined and cast.

Uses & applications

Extensively used in electrical wiring, electronics, plumbing, alloys (brass and bronze), architecture, and as an investment vehicle in the form of bullion bars.

Geological facts

Copper was the first metal to be worked by humans, beginning around 8000 BC. It is naturally antimicrobial, meaning it can kill bacteria and viruses on its surface.

Field identification & locations

Identified in nature by its reddish color, malleability, high conductivity, and green patina (malachite) when oxidized. Notable locations include the Keweenaw Peninsula in Michigan, USA, and Chile.