Comparison · Minerals
Calcite vs Heliodor
Calcite and Heliodor are easy to confuse because both are minerals. Heliodor is harder (Mohs 5) than Calcite (Mohs 3), so Heliodor will scratch Calcite and not the other way round. A copper coin (Mohs 3.5) scratches it, but a fingernail does not. Below is a side-by-side comparison of their properties and the quick tests that separate them.
Key differences between Calcite and Heliodor
- Heliodor is harder (Mohs 5) than Calcite (Mohs 3), so Heliodor will scratch Calcite and not the other way round. A copper coin (Mohs 3.5) scratches it, but a fingernail does not.
- Streak color differs: Calcite leaves a white streak on unglazed porcelain, Heliodor leaves white to light-colored.
- Hold a thin edge to the light: Calcite is transparent, Heliodor is opaque.
Calcite vs Heliodor properties
| Property | Calcite | Heliodor |
|---|---|---|
| Type | Minerals | Minerals |
| Mohs hardness | 3 | 5 |
| Luster | vitreous | vitreous |
| Streak | White | White to light-colored |
| Transparency | transparent | opaque |
| Specific gravity | 2.7 | 2.7 |
| Crystal system | trigonal | varies |
| Common colors | Colorless, White, Yellow, Orange, Blue, Green, Pink | Various |
| Rarity | common | common |
| Typical specimen value | $2–$100+ | $2–$150+ |
Which is more valuable?
Heliodor is usually the more valuable of the two: a typical collector specimen runs about $20 against $15 for Calcite, and premium Heliodor can reach $150 or more.
About Calcite
Calcite is one of the most common minerals on Earth, found in sedimentary, metamorphic, and igneous rocks. It's the primary component of limestone and marble.
About Heliodor
Heliodor is gem-quality greenish-yellow variety of beryl.
Calcite vs Heliodor FAQ
Is Calcite the same as Heliodor?
No. Both are minerals, but they are distinct species with different hardness, streak or luster. Heliodor is harder (Mohs 5) than Calcite (Mohs 3), so Heliodor will scratch Calcite and not the other way round. A copper coin (Mohs 3.5) scratches it, but a fingernail does not.
How can you tell Calcite from Heliodor?
Heliodor is harder (Mohs 5) than Calcite (Mohs 3), so Heliodor will scratch Calcite and not the other way round. A copper coin (Mohs 3.5) scratches it, but a fingernail does not. Streak color differs: Calcite leaves a white streak on unglazed porcelain, Heliodor leaves white to light-colored. Hold a thin edge to the light: Calcite is transparent, Heliodor is opaque.
Which is harder, Calcite or Heliodor?
Heliodor is harder: Mohs 5 against Mohs 3 for Calcite.
Which is more valuable, Calcite or Heliodor?
Heliodor is usually the more valuable of the two: a typical collector specimen runs about $20 against $15 for Calcite, and premium Heliodor can reach $150 or more.
