Comparison · Sedimentary Rocks vs Metamorphic Rocks
Limestone vs Marble
Limestone and Marble are easy to confuse. 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 Limestone and Marble
- Both sit near Mohs 3, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
- Luster is different: Limestone is dull while Marble is vitreous.
- Hold a thin edge to the light: Limestone is opaque, Marble is translucent.
- They overlap in white and gray, but Limestone also comes in brown and yellow and Marble also comes in pink, green, and black.
Limestone vs Marble properties
| Property | Limestone | Marble |
|---|---|---|
| Type | Sedimentary Rocks | Metamorphic Rocks |
| Mohs hardness | 3 | 3.5 |
| Luster | dull | vitreous |
| Streak | White | White |
| Transparency | opaque | translucent |
| Specific gravity | 2.7 | 2.7 |
| Crystal system | varies | varies |
| Common colors | White, Gray, Tan, Yellow | White, Gray, Pink, Green, Black |
| Rarity | common | common |
| Typical specimen value | $1–$50+ | $5–$500+ |
Which is more valuable?
Marble is usually the more valuable of the two: a typical collector specimen runs about $50 against $10 for Limestone, and premium Marble can reach $500 or more.
About Limestone
Limestone is a sedimentary rock composed mainly of calcium carbonate. It often contains fossils and is the precursor to marble.
About Marble
Marble is a metamorphic rock composed of recrystallized carbonate minerals. It has been used for sculpture and architecture since ancient times.
Limestone vs Marble FAQ
Is Limestone the same as Marble?
No. Limestone is a sedimentary rock while Marble is a metamorphic rock. 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 Limestone from Marble?
Both sit near Mohs 3, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. Luster is different: Limestone is dull while Marble is vitreous. Hold a thin edge to the light: Limestone is opaque, Marble is translucent.
Which is harder, Limestone or Marble?
Marble is harder: Mohs 3.5 against Mohs 3 for Limestone.
Which is more valuable, Limestone or Marble?
Marble is usually the more valuable of the two: a typical collector specimen runs about $50 against $10 for Limestone, and premium Marble can reach $500 or more.
