Comparison · Minerals
Aventurine vs Calcite
Aventurine and Calcite are easy to confuse because both are minerals. Aventurine is harder (Mohs 6.5–7) than Calcite (Mohs 3), so Aventurine 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 Aventurine and Calcite
- Aventurine is harder (Mohs 6.5–7) than Calcite (Mohs 3), so Aventurine 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: Aventurine is Translucent, Calcite is transparent.
- They overlap in green, blue, and orange, but Aventurine also comes in brown and red and Calcite also comes in clear, yellow, and pink.
- Well-formed crystals give it away: Aventurine is Trigonal, Calcite is trigonal.
Aventurine vs Calcite properties
| Property | Aventurine | Calcite |
|---|---|---|
| Type | Minerals | Minerals |
| Mohs hardness | 6.5–7 | 3 |
| Luster | Vitreous, aventurescent (glittery) | vitreous |
| Streak | White | White |
| Transparency | Translucent | transparent |
| Specific gravity | 2.64–2.69 | 2.7 |
| Crystal system | Trigonal | trigonal |
| Common colors | Green, Blue, Orange, Brown, Red | Colorless, White, Yellow, Orange, Blue, Green, Pink |
| Rarity | common | common |
| Typical specimen value | $2–$150+ | $2–$100+ |
Which is more valuable?
Aventurine is usually the more valuable of the two: a typical collector specimen runs about $20 against $15 for Calcite, and premium Aventurine can reach $150 or more.
About Aventurine
Aventurine is a variety of quartzite prized for aventurescence, a sparkly, glittery sheen caused by light reflecting off tiny platy mineral inclusions suspended within the rock. Green aventurine owes its color to included flakes of the chromium mica fuchsite, while orange to reddish varieties contain hematite or goethite instead. Though often sold alongside single minerals, it is technically a metamorphic rock made mostly of interlocking quartz grains.
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.
Aventurine vs Calcite FAQ
Is Aventurine the same as Calcite?
No. Both are minerals, but they are distinct species with different hardness, streak or luster. Aventurine is harder (Mohs 6.5–7) than Calcite (Mohs 3), so Aventurine 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 Aventurine from Calcite?
Aventurine is harder (Mohs 6.5–7) than Calcite (Mohs 3), so Aventurine 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: Aventurine is Translucent, Calcite is transparent. They overlap in green, blue, and orange, but Aventurine also comes in brown and red and Calcite also comes in clear, yellow, and pink.
Which is harder, Aventurine or Calcite?
Aventurine is harder: Mohs 6.5–7 against Mohs 3 for Calcite.
Which is more valuable, Aventurine or Calcite?
Aventurine is usually the more valuable of the two: a typical collector specimen runs about $20 against $15 for Calcite, and premium Aventurine can reach $150 or more.
