Comparison · Minerals
Copper vs Covellite
Copper and Covellite are easy to confuse because both are minerals. Copper is harder (Mohs 2.5–3) than Covellite (Mohs 1.5–2), so Copper will scratch Covellite and not the other way round. A fingernail (Mohs 2.5) scratches it easily. Below is a side-by-side comparison of their properties and the quick tests that separate them.
Key differences between Copper and Covellite
- Copper is harder (Mohs 2.5–3) than Covellite (Mohs 1.5–2), so Copper will scratch Covellite and not the other way round. A fingernail (Mohs 2.5) scratches it easily.
- Streak color differs: Copper leaves a copper red, shiny streak on unglazed porcelain, Covellite leaves lead-gray to black.
- Both look metallic, so compare color, tarnish and weight rather than shine.
- Copper feels noticeably heavier for its size (specific gravity 8.9–8.95 versus 4.6–4.76 for Covellite).
- They overlap in red and black, but Copper also comes in orange, brown, and green and Covellite also comes in blue, purple, and multicolored.
- Well-formed crystals give it away: Copper is Cubic, Covellite is Hexagonal.
Copper vs Covellite properties
| Property | Copper | Covellite |
|---|---|---|
| Type | Minerals | Minerals |
| Mohs hardness | 2.5–3 | 1.5–2 |
| Luster | Metallic | Metallic to submetallic/resinous |
| Streak | Copper red, shiny | Lead-gray to black |
| Transparency | Opaque | Opaque |
| Specific gravity | 8.9–8.95 | 4.6–4.76 |
| Crystal system | Cubic | Hexagonal |
| Common colors | Copper red (fresh), Brown to green-black (tarnished) | Indigo blue, Blue-black, Iridescent purple/red tarnish |
| Rarity | common | common |
| Typical specimen value | $2–$150+ | $2–$150+ |
Which is more valuable?
Typical specimens of Copper and Covellite trade in a similar range, around $20.
About Copper
Native copper is elemental copper, Cu, found uncombined in nature rather than bound up in an ore mineral, making it one of the relatively few metals that occurs in a directly usable metallic form at Earth's surface. It typically forms through the reduction of copper-bearing solutions in basaltic lava flows or in the oxidized zones above sulfide ore deposits. Native copper holds particular historical importance because ancient peoples were able to cold-hammer and later smelt it directly, marking one of humanity's earliest uses of metal.
About Covellite
Covellite is copper sulfide, CuS, a hexagonal mineral instantly recognizable for its deep indigo-blue color and the flashing, rainbow-like iridescence that appears on its surface as it tarnishes. It forms as a secondary mineral in the supergene enrichment zones of copper sulfide deposits, where descending groundwater alters primary copper minerals. Despite its striking appearance, covellite is quite soft and delicate compared to most sulfide minerals collectors encounter.
Copper vs Covellite FAQ
Is Copper the same as Covellite?
No. Both are minerals, but they are distinct species with different hardness, streak or luster. Copper is harder (Mohs 2.5–3) than Covellite (Mohs 1.5–2), so Copper will scratch Covellite and not the other way round. A fingernail (Mohs 2.5) scratches it easily.
How can you tell Copper from Covellite?
Copper is harder (Mohs 2.5–3) than Covellite (Mohs 1.5–2), so Copper will scratch Covellite and not the other way round. A fingernail (Mohs 2.5) scratches it easily. Streak color differs: Copper leaves a copper red, shiny streak on unglazed porcelain, Covellite leaves lead-gray to black. Both look metallic, so compare color, tarnish and weight rather than shine.
Which is harder, Copper or Covellite?
Copper is harder: Mohs 2.5–3 against Mohs 1.5–2 for Covellite.
Which is more valuable, Copper or Covellite?
Typical specimens of Copper and Covellite trade in a similar range, around $20.
