Comparison · Minerals
Calcite vs Chrysoprase
Calcite and Chrysoprase are easy to confuse because both are minerals. Chrysoprase is harder (Mohs 6.5–7) than Calcite (Mohs 3), so Chrysoprase 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 Chrysoprase
- Chrysoprase is harder (Mohs 6.5–7) than Calcite (Mohs 3), so Chrysoprase 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, Chrysoprase is Translucent.
- They overlap in green, but Calcite also comes in clear, yellow, orange, blue, and pink.
- Well-formed crystals give it away: Calcite is trigonal, Chrysoprase is Trigonal (cryptocrystalline).
Calcite vs Chrysoprase properties
| Property | Calcite | Chrysoprase |
|---|---|---|
| Type | Minerals | Minerals |
| Mohs hardness | 3 | 6.5–7 |
| Luster | vitreous | Waxy to vitreous |
| Streak | White | White |
| Transparency | transparent | Translucent |
| Specific gravity | 2.7 | 2.58–2.64 |
| Crystal system | trigonal | Trigonal (cryptocrystalline) |
| Common colors | Colorless, White, Yellow, Orange, Blue, Green, Pink | Apple-green, Green (sometimes with darker spots) |
| Rarity | common | common |
| Typical specimen value | $2–$100+ | $2–$150+ |
Which is more valuable?
Chrysoprase is usually the more valuable of the two: a typical collector specimen runs about $20 against $15 for Calcite, and premium Chrysoprase 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 Chrysoprase
Chrysoprase is an apple-green to yellowish-green variety of chalcedony, a cryptocrystalline form of quartz, colored by trace nickel locked into its silica structure. It forms in weathered nickel-rich ultramafic rocks, where silica-bearing groundwater deposits it in cavities and fractures. Fine material is prized in jewelry as one of the few naturally green gemstones that owes its hue to neither chromium nor copper.
Calcite vs Chrysoprase FAQ
Is Calcite the same as Chrysoprase?
No. Both are minerals, but they are distinct species with different hardness, streak or luster. Chrysoprase is harder (Mohs 6.5–7) than Calcite (Mohs 3), so Chrysoprase 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 Chrysoprase?
Chrysoprase is harder (Mohs 6.5–7) than Calcite (Mohs 3), so Chrysoprase 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, Chrysoprase is Translucent. They overlap in green, but Calcite also comes in clear, yellow, orange, blue, and pink.
Which is harder, Calcite or Chrysoprase?
Chrysoprase is harder: Mohs 6.5–7 against Mohs 3 for Calcite.
Which is more valuable, Calcite or Chrysoprase?
Chrysoprase is usually the more valuable of the two: a typical collector specimen runs about $20 against $15 for Calcite, and premium Chrysoprase can reach $150 or more.
