Cuprite is a striking deep-red secondary mineral that forms in the oxidized zones of copper deposits. It often appears as brilliant, gemmy octahedral crystals or as the fibrous, hair-like variety known as chalcotrichite. Collectors should handle it with care due to its softness and high density, and always wash hands after handling due to its copper content.
Is this cuprite?
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 cuprite with a known reference. Cuprite sits at Mohs 3.5-4 — softer than the next harder reference, harder than the previous one.
- 2Check the streakDrag the specimen across an unglazed porcelain plate. Cuprite leaves a brownish-red streak.
- 3Read the lusterHold the specimen under a strong light. Cuprite typically shows a adamantine luster.
- 4Match the color rangeCompare against the expected color range: red, dark red, cochineal red.
- 5Look at form & habitCrystal system: isometric. Typical habit: cubic crystals, octahedral, acicular (chalcotrichite variety), massive.
Often confused with
Cuprite vs. its common look-alikes — and how to tell them apart in the field.
How to tell apart: Cuprite is noticeably harder (Mohs 3.5-4 vs. 2-2.5); streak differs — Cuprite leaves brownish-red, Cinnabar leaves scarlet.
How to tell apart: Cuprite is noticeably harder (Mohs 3.5-4 vs. 2-2.5); streak differs — Cuprite leaves brownish-red, Proustite leaves scarlet.
How to tell apart: Iron Ore is the harder of the two (Mohs 5-6.5 vs. 3.5-4); streak differs — Cuprite leaves brownish-red, Iron Ore leaves reddish-brown to black; luster reads adamantine on Cuprite and metallic to submetallic on Iron Ore.
Often found alongside cuprite
Minerals reported to co-occur with cuprite. Spotting these in float or country rock is a strong cue you are in the right ground.
All properties
- Chemical formula
- Cu₂O
- Mohs hardness
- 3.5-4
- Density
- 6.14 g/cm³
- Colors
- Streak
- Brownish-red
- Luster
- Adamantine
- Transparency
- Translucent
- Crystal system
- Isometric
- Crystal habit
- Cubic Crystals, Octahedral, Acicular (chalcotrichite Variety), Massive
- Cleavage
- Poor
- Rarity
- Common
- Uses
- Collector, Minor Copper Ore
- Host rock
- Oxidized Zones of Copper Ore Deposits
- Typical price
- $10-100 for small specimens, $200-1000+ for fine crystals
Where rockhounds find cuprite
30 mapped spotsClassic worldwide localities
- Bisbee, Arizona (USA)
- Tsumeb, Namibia
- Chuquicamata, Chile
- Dzhezkazgan, Kazakhstan
- Cornwall, England
U.S. states with cuprite
Each link opens a state-specific list of mapped rockhounding spots that produce cuprite.
Field-hunting tip
Look in oxidized zones of copper ore deposits country — that is the host setting where cuprite typically forms. If you start seeing native copper, malachite, azurite in float, you are in the right ground. Field specimens usually show a cubic crystals, octahedral, acicular (chalcotrichite variety), massive habit, so train your eye for that shape before scanning the outcrop. In the U.S., the densest reported localities are in Utah, Missouri, New Jersey — start trip planning there.
Common questions
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Find cuprite on the map
RockHoundR shows mapped rockhounding spots, access rules, and lets you log every find.
