mineral
Native copper-bearing rock (probable copper ore)
Native copper (Cu), likely with copper sulfide/oxide minerals in a host rock
AI-generated identification · may be incorrectMetallic copper-red and dark gray/black patches; native copper is Mohs 2.5–3, opaque, metallic, malleable, and commonly occurs as irregular grains or veins. The specimen appears rough and matrix-bearing, but exact minerals cannot be confirmed from the image alone.
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Physical properties
Metallic copper-red and dark gray/black patches; native copper is Mohs 2.5–3, opaque, metallic, malleable, and commonly occurs as irregular grains or veins. The specimen appears rough and matrix-bearing, but exact minerals cannot be confirmed from the image alone.
Formation & geological history
Forms in hydrothermal veins and oxidized zones of copper deposits, commonly associated with basalt or other volcanic rocks; ages vary from Precambrian to recent geologic settings.
Uses & applications
Copper is important for electrical wiring, plumbing, alloys, and industry; attractive native-copper specimens are collected, though this small rough piece has limited gem value.
Geological facts
Copper’s distinctive red-orange metallic color and malleability help distinguish it from most sulfide minerals. It may develop green patina from oxidation.
Field identification & locations
Likely identification requires a streak, conductivity, density, and examination for malleability; copper commonly occurs in Michigan’s Keweenaw Peninsula, Arizona, Chile, and Australia.
