Native Copper is an iconic metal that often occurs as heavy, reddish-brown masses or intricate branching wire-like structures. Collectors should look for its characteristic copper-red metallic luster on fresh surfaces, though it is frequently covered by a dull brown tarnish or a soft green malachite crust.
Is this native copper?
5-step field checkRun through these checks against the specimen in your hand. The more boxes tick, the more confident the ID.
- 1Test the hardnessTry to scratch native copper with a known reference. Native Copper sits at Mohs 2.5-3, softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Streak: rose.
- 3Read the lusterHold the specimen under a strong light. Luster: metallic.
- 4Match the color rangeCompare against the expected color range: copper-red, reddish-brown, tarnished-brown, green-patina, brown, light pink, red.
- 5Look at form & habitCrystal system: cubic. Typical habit: arborescent, nodular.
Often confused with
Native Copper vs. its common look-alikes, and how to tell them apart in the field.
How to tell apart: Streak differs, so Native Copper leaves rose, Cuprite leaves brownish red, shining; luster reads metallic on Native Copper and adamantine to submetallic, earthy on Cuprite.
How to tell apart: Nickeline is the harder of the two (Mohs 5-5.5 vs. 2.5-3); streak differs, so Native Copper leaves rose, Nickeline leaves pale brownish black.
How to tell apart: Algodonite is the harder of the two (Mohs 4 vs. 2.5-3); streak differs, so Native Copper leaves rose, Algodonite leaves white; luster reads metallic on Native Copper and bright metallic on Algodonite.
Often found alongside native copper
Minerals reported to co-occur with native copper. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- Cu
- Mohs hardness
- 2.5-3
- Density
- 8.95 g/cm³
- Colors
- Streak
- Rose
- Luster
- Metallic
- Transparency
- Opaque
- Crystal system
- Cubic
- Crystal habit
- Arborescent, nodular
- Cleavage
- None
- Rarity
- Common
- Uses
- Collector, Specimen, Industrial, Historical
- Host rock
- Commonly associated with porous zones in mafic extrusive rocks, less commonly in sandstones and shales, where the copper was probably of hydrothermal origin, precipitated as the result of oxidizing conditions
Where rockhounds find native copper
4 mapped spotsClassic worldwide localities
- Keweenaw Peninsula, Keweenaw and Houghton Cos., Michigan, USA
- New Cornelia mine, Ajo, Pima Co., Arizona, USA
- Bisbee, Cochise Co., Arizona, USA
- Ray, Gila Co., Arizona, USA
- Onganja mine, 60 km northeast of Windhoek, and at Tsumeb, Namibia
- Turinsk copper mine, Bogoslovsk, Ural Mountains, Russia
Field-hunting tip
Where it forms: Commonly associated with porous zones in mafic extrusive rocks, less commonly in sandstones and shales, where the copper was probably of hydrothermal origin, precipitated as the result of oxidizing conditions. If you start seeing silver, chalcocite, bornite in float, you are in the right ground. Typical habit: arborescent, nodular. Train your eye for that shape before scanning the outcrop. In the U.S., the densest reported localities are in Michigan, California. Start trip planning there.
Common questions
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Find native copper on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
