Comparison · Minerals
Albite vs Calcite
Albite and Calcite are easy to confuse because both are minerals. Albite is harder (Mohs 6–6.5) than Calcite (Mohs 3), so Albite 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 Albite and Calcite
- Albite is harder (Mohs 6–6.5) than Calcite (Mohs 3), so Albite 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: Albite is Transparent to translucent, Calcite is transparent.
- They overlap in clear, green, and blue, but Albite also comes in gray and Calcite also comes in yellow, orange, and pink.
- Well-formed crystals give it away: Albite is Triclinic, Calcite is trigonal.
Albite vs Calcite properties
| Property | Albite | Calcite |
|---|---|---|
| Type | Minerals | Minerals |
| Mohs hardness | 6–6.5 | 3 |
| Luster | Vitreous, pearly on cleavage | vitreous |
| Streak | White | White |
| Transparency | Transparent to translucent | transparent |
| Specific gravity | 2.60–2.65 | 2.7 |
| Crystal system | Triclinic | trigonal |
| Common colors | White, Colorless, Gray, Greenish, Pale blue (rare) | Colorless, White, Yellow, Orange, Blue, Green, Pink |
| Rarity | common | common |
| Typical specimen value | $2–$150+ | $2–$100+ |
Which is more valuable?
Albite is usually the more valuable of the two: a typical collector specimen runs about $20 against $15 for Calcite, and premium Albite can reach $150 or more.
About Albite
Albite is the sodium-rich end-member of the plagioclase feldspar series, with the formula NaAlSi3O8, forming a continuous solid-solution series with the calcium end-member anorthite. It typically appears as white, cream, or pale gray tabular crystals with two cleavage directions meeting near a right angle. Its low density and glassy luster set it apart from denser silicates, and it is a defining component of many granites, gneisses, and pegmatites.
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.
Albite vs Calcite FAQ
Is Albite the same as Calcite?
No. Both are minerals, but they are distinct species with different hardness, streak or luster. Albite is harder (Mohs 6–6.5) than Calcite (Mohs 3), so Albite 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 Albite from Calcite?
Albite is harder (Mohs 6–6.5) than Calcite (Mohs 3), so Albite 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: Albite is Transparent to translucent, Calcite is transparent. They overlap in clear, green, and blue, but Albite also comes in gray and Calcite also comes in yellow, orange, and pink.
Which is harder, Albite or Calcite?
Albite is harder: Mohs 6–6.5 against Mohs 3 for Calcite.
Which is more valuable, Albite or Calcite?
Albite is usually the more valuable of the two: a typical collector specimen runs about $20 against $15 for Calcite, and premium Albite can reach $150 or more.
