Comparison · Sedimentary Rocks
Dolostone vs Limestone
Dolostone and Limestone are easy to confuse because both are sedimentary rocks. Both sit near Mohs 3.5, 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 Dolostone and Limestone
- Both sit near Mohs 3.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
- They overlap in brown, gray, and white, but Limestone also comes in yellow.
Dolostone vs Limestone properties
| Property | Dolostone | Limestone |
|---|---|---|
| Type | Sedimentary Rocks | Sedimentary Rocks |
| Mohs hardness | 3.5 | 3 |
| Luster | dull | dull |
| Streak | White | White |
| Transparency | opaque | opaque |
| Specific gravity | 2.85 | 2.7 |
| Crystal system | varies | varies |
| Common colors | Tan, Gray, White, Cream, Brown | White, Gray, Tan, Yellow |
| Rarity | common | common |
| Typical specimen value | $1–$75+ | $1–$50+ |
Which is more valuable?
Typical specimens of Dolostone and Limestone trade in a similar range, around $10.
About Dolostone
Dolostone is a carbonate sedimentary rock composed mostly of the mineral dolomite. It often resembles limestone but may react more weakly with dilute acid.
About Limestone
Limestone is a sedimentary rock composed mainly of calcium carbonate. It often contains fossils and is the precursor to marble.
Dolostone vs Limestone FAQ
Is Dolostone the same as Limestone?
No. Both are sedimentary rocks, but they are distinct rock types with different hardness, streak or luster. Both sit near Mohs 3.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
How can you tell Dolostone from Limestone?
Both sit near Mohs 3.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. They overlap in brown, gray, and white, but Limestone also comes in yellow.
Which is harder, Dolostone or Limestone?
Dolostone is harder: Mohs 3.5 against Mohs 3 for Limestone.
Which is more valuable, Dolostone or Limestone?
Typical specimens of Dolostone and Limestone trade in a similar range, around $10.
