Where is Native Copper found?
Copper (Cu)
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Open the appNative Copper occurs in specific geological environments. Knowing where to look, and in what kind of rock, is the difference between going home empty-handed and finding a great specimen.
Where to find Native Copper
Keweenaw Peninsula, Michigan, USA
World-renowned for its vast native copper deposits, primarily found in Precambrian basaltic lava flows and interbedded conglomerates. These deposits were historically mined on a massive scale.
Corocoro, Bolivia
Known for significant native copper occurrences in sedimentary rocks, particularly sandstones and conglomerates.
Bisbee, Arizona, USA
While primarily known for its copper sulfide ores, native copper was also found in the oxidized zones of these deposits.
Broken Hill, New South Wales, Australia
Occurrences of native copper have been reported in association with other copper minerals.
Russia (Urals region)
Various localities have yielded native copper, often in hydrothermal settings.
Collecting tips
- Look for Basaltic Environments. In regions with ancient basaltic lava flows, particularly those with amygdaloidal structures (gas bubbles filled with secondary minerals), native copper can be found filling these cavities.
- Check Oxidized Zones of Copper Deposits. Native copper can occur in the upper, oxidized portions of copper sulfide ore bodies, where primary sulfides have been altered by weathering processes.
- Examine Sedimentary Rocks. In certain sedimentary environments, such as red bed sandstones and conglomerates, native copper can precipitate, often replacing organic material or acting as a cement.
- Test for Malleability. Native copper is highly malleable. A small piece can be flattened with a hammer without shattering, which distinguishes it from most other metallic-looking minerals.
- Observe Tarnish. The distinctive reddish-orange color on fresh surfaces, and the common green (malachite) or dark tarnish, are good indicators.
Quick Check
- Color:
- Reddish-orange (fresh) to dark brown/green/black (tarnished)
- Luster:
- Metallic
- Streak:
- Copper-red (on unglazed porcelain plate)
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