Comparison · Minerals
Benitoite vs Calcite
Benitoite and Calcite are easy to confuse because both are minerals. Benitoite is harder (Mohs 6–6.5) than Calcite (Mohs 3), so Benitoite 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 Benitoite and Calcite
- Benitoite is harder (Mohs 6–6.5) than Calcite (Mohs 3), so Benitoite will scratch Calcite and not the other way round. A copper coin (Mohs 3.5) scratches it, but a fingernail does not.
- Benitoite feels noticeably heavier for its size (specific gravity 3.6–3.7 versus 2.7 for Calcite).
- Hold a thin edge to the light: Benitoite is Transparent, Calcite is transparent.
- They overlap in blue, clear, and pink, but Calcite also comes in yellow, orange, and green.
- Well-formed crystals give it away: Benitoite is Trigonal, Calcite is trigonal.
Benitoite vs Calcite properties
| Property | Benitoite | Calcite |
|---|---|---|
| Type | Minerals | Minerals |
| Mohs hardness | 6–6.5 | 3 |
| Luster | Vitreous | vitreous |
| Streak | White | White |
| Transparency | Transparent | transparent |
| Specific gravity | 3.6–3.7 | 2.7 |
| Crystal system | Trigonal | trigonal |
| Common colors | Blue, Colorless, Pink, White | Colorless, White, Yellow, Orange, Blue, Green, Pink |
| Rarity | common | common |
| Typical specimen value | $2–$150+ | $2–$100+ |
Which is more valuable?
Benitoite is usually the more valuable of the two: a typical collector specimen runs about $20 against $15 for Calcite, and premium Benitoite can reach $150 or more.
About Benitoite
Benitoite is a rare barium titanium silicate, BaTiSi3O9, notable as one of the few minerals crystallizing in the ditrigonal-dipyramidal class of the hexagonal system. It is best known for its vivid sapphire-blue color and its powerful blue fluorescence under shortwave ultraviolet light. First described in 1907 from California's San Benito County, it later became the official state gemstone of California.
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.
Benitoite vs Calcite FAQ
Is Benitoite the same as Calcite?
No. Both are minerals, but they are distinct species with different hardness, streak or luster. Benitoite is harder (Mohs 6–6.5) than Calcite (Mohs 3), so Benitoite 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 Benitoite from Calcite?
Benitoite is harder (Mohs 6–6.5) than Calcite (Mohs 3), so Benitoite will scratch Calcite and not the other way round. A copper coin (Mohs 3.5) scratches it, but a fingernail does not. Benitoite feels noticeably heavier for its size (specific gravity 3.6–3.7 versus 2.7 for Calcite). Hold a thin edge to the light: Benitoite is Transparent, Calcite is transparent.
Which is harder, Benitoite or Calcite?
Benitoite is harder: Mohs 6–6.5 against Mohs 3 for Calcite.
Which is more valuable, Benitoite or Calcite?
Benitoite is usually the more valuable of the two: a typical collector specimen runs about $20 against $15 for Calcite, and premium Benitoite can reach $150 or more.
