mineral
Native Copper Nugget
Native Copper (Cu)
AI-generated identification · may be incorrectHardness: 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
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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.
