mineral

Native Copper Nugget

Native Copper (Cu)

Hardness: 2.5–3.0 Mohs; Color: Copper-red to reddish-brown (often with green patina); Luster: Metallic; Crystal Structure: Isometric; Cleavage: None; Specific Gravity: 8.9

Hardness: 2
Color: Copper-red to reddish-brown (often with green patina)
Luster: Metallic

Identified April 12, 2026More mineral →

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Physical properties

Hardness: 2.5–3.0 Mohs; Color: Copper-red to reddish-brown (often with green patina); Luster: Metallic; Crystal Structure: Isometric; Cleavage: None; Specific Gravity: 8.9

Formation & geological history

Formed as a primary mineral in hydrothermal veins or as a secondary mineral in oxidized zones of copper deposits. Common in basaltic lavas where fluids precipitate copper into voids.

Uses & applications

Major industrial use for electrical wiring and plumbing; also used in jewelry, as currency (historical), and as highly sought-after display specimens for collectors.

Geological facts

Native copper was the first metal to be worked by humans, starting over 10,000 years ago. One of the largest masses ever found was in Keweenaw Peninsula, Michigan, weighing 420 tons.

Field identification & locations

Identify by its high density, 'hackly' fracture, malleability (it bends rather than breaks), and characteristic reddish-brown streak. Found in basaltic regions like Michigan or the copper belts of Arizona and Chile.