Comparison · Minerals
Calcite vs Danburite
Calcite and Danburite are easy to confuse because both are minerals. Danburite is harder (Mohs 7–7.5) than Calcite (Mohs 3), so Danburite 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 Danburite
- Danburite is harder (Mohs 7–7.5) than Calcite (Mohs 3), so Danburite will scratch Calcite and not the other way round. A copper coin (Mohs 3.5) scratches it, but a fingernail does not.
- Hold a thin edge to the light: Calcite is transparent, Danburite is Transparent to translucent.
- They overlap in clear, yellow, and pink, but Calcite also comes in orange, blue, and green and Danburite also comes in brown.
- Well-formed crystals give it away: Calcite is trigonal, Danburite is Orthorhombic.
Calcite vs Danburite properties
| Property | Calcite | Danburite |
|---|---|---|
| Type | Minerals | Minerals |
| Mohs hardness | 3 | 7–7.5 |
| Luster | vitreous | Vitreous |
| Streak | White | White |
| Transparency | transparent | Transparent to translucent |
| Specific gravity | 2.7 | 2.97–3.02 |
| Crystal system | trigonal | Orthorhombic |
| Common colors | Colorless, White, Yellow, Orange, Blue, Green, Pink | Colorless, Pale yellow, Brownish yellow, Pink |
| Rarity | common | common |
| Typical specimen value | $2–$100+ | $2–$150+ |
Which is more valuable?
Danburite is usually the more valuable of the two: a typical collector specimen runs about $20 against $15 for Calcite, and premium Danburite 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 Danburite
Danburite is calcium borosilicate, CaB2Si2O8, crystallizing in the orthorhombic system as prismatic crystals that closely resemble topaz at a glance. It was first identified near Danbury, Connecticut, which gave the mineral its name, though the finest modern specimens come from Mexico and Madagascar. Its glassy luster and typically pale coloring make it a favorite among faceted-gem collectors seeking an affordable topaz alternative.
Calcite vs Danburite FAQ
Is Calcite the same as Danburite?
No. Both are minerals, but they are distinct species with different hardness, streak or luster. Danburite is harder (Mohs 7–7.5) than Calcite (Mohs 3), so Danburite 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 Danburite?
Danburite is harder (Mohs 7–7.5) than Calcite (Mohs 3), so Danburite will scratch Calcite and not the other way round. A copper coin (Mohs 3.5) scratches it, but a fingernail does not. Hold a thin edge to the light: Calcite is transparent, Danburite is Transparent to translucent. They overlap in clear, yellow, and pink, but Calcite also comes in orange, blue, and green and Danburite also comes in brown.
Which is harder, Calcite or Danburite?
Danburite is harder: Mohs 7–7.5 against Mohs 3 for Calcite.
Which is more valuable, Calcite or Danburite?
Danburite is usually the more valuable of the two: a typical collector specimen runs about $20 against $15 for Calcite, and premium Danburite can reach $150 or more.
