Native copper is a metallic element characterized by its distinct copper-red color and high density. It is frequently found in massive, dendritic, or arborescent forms, particularly in the famous basalt flows of Michigan's Keweenaw Peninsula, and can develop a dark brown or green patina due to oxidation.
Is this copper nuggets?
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 copper nuggets with a known reference. Copper Nuggets 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. Copper Nuggets leaves a copper-red streak.
- 3Read the lusterHold the specimen under a strong light. Copper Nuggets typically shows a metallic luster.
- 4Match the color rangeCompare against the expected color range: reddish-brown, copper-red, tarnished brown, green.
- 5Look at form & habitCrystal system: isometric. Typical habit: massive, dendritic, arborescent, wire, nuggets.
Often confused with
Copper Nuggets vs. its common look-alikes, and how to tell them apart in the field.
Often found alongside copper nuggets
Minerals reported to co-occur with copper nuggets. 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
- 8.9 g/cm³
- Streak
- Copper-red
- Luster
- Metallic
- Transparency
- Opaque
- Crystal system
- Isometric
- Crystal habit
- Massive, Dendritic, Arborescent, Wire, Nuggets
- Cleavage
- None
- Rarity
- Common
- Uses
- Collector, Ornamental
- Host rock
- Basaltic Lavas, Hydrothermal Veins, Sedimentary Rocks
- Typical price
- $10-200 depending on size and crystal quality
Where rockhounds find copper nuggets
1 mapped spotsClassic worldwide localities
- Keweenaw Peninsula, Michigan, USA
- Corocoro, Bolivia
- Tsumeb, Namibia
- Dzhezkazgan, Kazakhstan
Field-hunting tip
Look in basaltic lavas, hydrothermal veins, sedimentary rocks country, the host setting where copper nuggets typically forms. If you start seeing calcite, quartz, prehnite in float, you are in the right ground. Field specimens usually show a massive, dendritic, arborescent, wire, nuggets habit, so train your eye for that shape before scanning the outcrop. In the U.S., the densest reported localities are in California. Start trip planning there.
More copper nuggets photos
Common questions
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Find copper nuggets on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
