Comparison · Minerals
Dioptase vs Malachite
Dioptase and Malachite are easy to confuse because both are minerals. Dioptase is harder (Mohs 5) than Malachite (Mohs 4), so Dioptase will scratch Malachite and not the other way round. A steel knife blade (Mohs 5.5) scratches it; a copper coin does not. Below is a side-by-side comparison of their properties and the quick tests that separate them.
Key differences between Dioptase and Malachite
- Dioptase is harder (Mohs 5) than Malachite (Mohs 4), so Dioptase will scratch Malachite and not the other way round. A steel knife blade (Mohs 5.5) scratches it; a copper coin does not.
- Streak color differs: Dioptase leaves a green streak on unglazed porcelain, Malachite leaves pale green.
- Luster is different: Dioptase is vitreous while Malachite is silky.
- Malachite feels noticeably heavier for its size (specific gravity 4 versus 3.28–3.35 for Dioptase).
- Hold a thin edge to the light: Dioptase is Transparent to translucent, Malachite is opaque.
- They overlap in green, but Malachite also comes in multicolored.
- Well-formed crystals give it away: Dioptase is Trigonal, Malachite is monoclinic.
Dioptase vs Malachite properties
| Property | Dioptase | Malachite |
|---|---|---|
| Type | Minerals | Minerals |
| Mohs hardness | 5 | 4 |
| Luster | Vitreous | silky |
| Streak | Green | Pale green |
| Transparency | Transparent to translucent | opaque |
| Specific gravity | 3.28–3.35 | 4 |
| Crystal system | Trigonal | monoclinic |
| Common colors | Emerald green, Bluish green | Green, Dark Green, Banded Green |
| Rarity | common | common |
| Typical specimen value | $2–$150+ | $5–$200+ |
Which is more valuable?
Malachite is usually the more valuable of the two: a typical collector specimen runs about $30 against $20 for Dioptase, and premium Malachite can reach $200 or more.
About Dioptase
Dioptase is a copper cyclosilicate mineral, Cu6Si6O18·6H2O, prized for an intense emerald-green color that rivals fine emerald despite being a completely different mineral species. It forms in the oxidized zones of copper ore deposits under arid conditions, typically as small but brilliantly lustrous crystals. Dioptase is too soft and brittle to be widely used as a gemstone, so its value lies almost entirely with mineral collectors.
About Malachite
Malachite is a vibrant green copper carbonate mineral known for its distinctive banded patterns. It has been used as a gemstone and pigment for thousands of years.
Dioptase vs Malachite FAQ
Is Dioptase the same as Malachite?
No. Both are minerals, but they are distinct species with different hardness, streak or luster. Dioptase is harder (Mohs 5) than Malachite (Mohs 4), so Dioptase will scratch Malachite and not the other way round. A steel knife blade (Mohs 5.5) scratches it; a copper coin does not.
How can you tell Dioptase from Malachite?
Dioptase is harder (Mohs 5) than Malachite (Mohs 4), so Dioptase will scratch Malachite and not the other way round. A steel knife blade (Mohs 5.5) scratches it; a copper coin does not. Streak color differs: Dioptase leaves a green streak on unglazed porcelain, Malachite leaves pale green. Luster is different: Dioptase is vitreous while Malachite is silky.
Which is harder, Dioptase or Malachite?
Dioptase is harder: Mohs 5 against Mohs 4 for Malachite.
Which is more valuable, Dioptase or Malachite?
Malachite is usually the more valuable of the two: a typical collector specimen runs about $30 against $20 for Dioptase, and premium Malachite can reach $200 or more.
