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Cuprite
Cuprite is oxide (copper), Cu₂O. In the hand, it rates 3.5 to 4 on the Mohs scale, and it runs deep garnet red and crimson-black. Deep garnet-red heavy mineral with near-metallic diamond luster and a shining red-brown streak, usually keeping company with green malachite. Oxidized copper deposits: Tsumeb (Namibia), Mashamba (DR Congo), Cornwall (England), Arizona (USA).
The geology.
Cuprite carries the formula Cu₂O. It belongs to the isometric system. On paper it is oxide (copper).
It sits at 3.5 to 4 on the Mohs scale. The surface reads adamantine to submetallic. Light behaviour is translucent deep red to opaque. Specific gravity runs 5.8 to 6.2. The streak is brownish red, shining. It breaks with indistinct cleavage; conchoidal fracture.
Deep garnet-red heavy mineral with near-metallic diamond luster and a shining red-brown streak, usually keeping company with green malachite.
Expect to see it as octahedral crystals, massive with malachite coatings or hair-like chalcotrichite tufts.
The origins.
Oxidized copper deposits: Tsumeb (Namibia), Mashamba (DR Congo), Cornwall (England), Arizona (USA).
On value, the database notes: mid-range; gemmy crystals and chalcotrichite are prized.
Traditional associations.
In energy work traditions, associated with vitality, security, and life-force themes.
Recorded here because it is part of how this material is sold, not because it is a property of the material.
Spotting the real thing.
Deep garnet-red heavy mineral with near-metallic diamond luster and a shining red-brown streak, usually keeping company with green malachite.
| Looks like | How to tell them apart |
|---|---|
| Garnet (almandine) | Garnet is glassy, far harder, and streaks white |
| Hematite | Hematite is gray-metallic with red-brown streak but never translucent red |
| Realgar | Realgar is much softer and lighter, orange-red |
At-home tests.
None of these need a lab. A 10x loupe, good daylight and a steady hand cover most of what a buyer needs to know about cuprite.
| Test | What you should see |
|---|---|
| By eye | Shining brownish-red streak |
| By eye | Heavy (SG ~6) |
| Scratch check | Knife scratches it |
| By eye | Often rimmed by green malachite |
Stop short of anything that leaves a mark. A gemologist can answer the rest without damaging the stone.
Care & handling.
At 3.5 to 4 on the Mohs scale this is a soft material. Keep it as a display piece, store it apart from harder stones, and skip daily-wear settings.
It breaks with indistinct cleavage; conchoidal fracture, which is worth knowing before you set it or drop it.
Skip the ultrasonic. Lukewarm water, mild soap and a soft cloth handle routine cleaning without risk.
Copper mineral, wash hands after handling crumbly material.
A deeper look.
Extended detail on composition, sourcing, authentication and market value.
The physical record
The formula on record is Cu₂O. Crystal system: Isometric. Specific gravity: 5.8 to 6.2. Streak: Brownish red, shining. Cleavage and fracture: Indistinct cleavage; conchoidal fracture.
How it reaches the market
Oxidized copper deposits: Tsumeb (Namibia), Mashamba (DR Congo), Cornwall (England), Arizona (USA).
What it gets confused with
Garnet (almandine): Garnet is glassy, far harder, and streaks white. Hematite: Hematite is gray-metallic with red-brown streak but never translucent red. Realgar: Realgar is much softer and lighter, orange-red.
What it is worth
Mid-range; gemmy crystals and chalcotrichite are prized.
One more thing
Gem cuprite's red is so deep that faceted stones look black until strong light ignites them crimson, cut ones are nearly all from one Namibian find.
An education-first guide.
We do not carry cuprite. This page exists because the question comes up and the honest answer is worth writing down, whether or not there is anything here to sell you.
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