Comparison · Minerals
Calcite vs Cinnabar
Calcite and Cinnabar are easy to confuse because both are minerals. Both sit near Mohs 3, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. Below is a side-by-side comparison of their properties and the quick tests that separate them.
Key differences between Calcite and Cinnabar
- Both sit near Mohs 3, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
- Streak color differs: Calcite leaves a white streak on unglazed porcelain, Cinnabar leaves scarlet red.
- Cinnabar feels noticeably heavier for its size (specific gravity 8.0–8.2 versus 2.7 for Calcite).
- Hold a thin edge to the light: Calcite is transparent, Cinnabar is Transparent to opaque.
- Well-formed crystals give it away: Calcite is trigonal, Cinnabar is Trigonal.
Calcite vs Cinnabar properties
| Property | Calcite | Cinnabar |
|---|---|---|
| Type | Minerals | Minerals |
| Mohs hardness | 3 | 2–2.5 |
| Luster | vitreous | Adamantine to dull/earthy |
| Streak | White | Scarlet red |
| Transparency | transparent | Transparent to opaque |
| Specific gravity | 2.7 | 8.0–8.2 |
| Crystal system | trigonal | Trigonal |
| Common colors | Colorless, White, Yellow, Orange, Blue, Green, Pink | Red, Brownish red, Gray where tarnished |
| Rarity | common | common |
| Typical specimen value | $2–$100+ | $2–$150+ |
Which is more valuable?
Cinnabar is usually the more valuable of the two: a typical collector specimen runs about $20 against $15 for Calcite, and premium Cinnabar 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 Cinnabar
Cinnabar is mercury sulfide, HgS, the principal ore mineral of mercury and one of the most historically significant toxic minerals in human history. It forms a brilliant red to brownish-red mineral typically deposited by low-temperature hydrothermal fluids near volcanic activity and hot springs, often associated with recent or geologically young volcanic terrains. Cinnabar has been mined for millennia both for its metal content and, historically and dangerously, as a pigment source.
Calcite vs Cinnabar FAQ
Is Calcite the same as Cinnabar?
No. Both are minerals, but they are distinct species with different hardness, streak or luster. Both sit near Mohs 3, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
How can you tell Calcite from Cinnabar?
Both sit near Mohs 3, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. Streak color differs: Calcite leaves a white streak on unglazed porcelain, Cinnabar leaves scarlet red. Cinnabar feels noticeably heavier for its size (specific gravity 8.0–8.2 versus 2.7 for Calcite).
Which is harder, Calcite or Cinnabar?
Calcite is harder: Mohs 3 against Mohs 2–2.5 for Cinnabar.
Which is more valuable, Calcite or Cinnabar?
Cinnabar is usually the more valuable of the two: a typical collector specimen runs about $20 against $15 for Calcite, and premium Cinnabar can reach $150 or more.
