Comparison · Sedimentary Rocks
Caliche vs Limestone
Caliche and Limestone are easy to confuse because both are sedimentary rocks. 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 Caliche and Limestone
- Both sit near Mohs 3, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
- Streak color differs: Caliche leaves a white to pale tan streak on unglazed porcelain, Limestone leaves white.
- They overlap in white, brown, and gray, but Limestone also comes in yellow.
Caliche vs Limestone properties
| Property | Caliche | Limestone |
|---|---|---|
| Type | Sedimentary Rocks | Sedimentary Rocks |
| Mohs hardness | 3 | 3 |
| Luster | dull | dull |
| Streak | White to pale tan | White |
| Transparency | opaque | opaque |
| Specific gravity | 2.4 | 2.7 |
| Crystal system | varies | varies |
| Common colors | White, Cream, Tan, Gray, Brown | White, Gray, Tan, Yellow |
| Rarity | common | common |
| Typical specimen value | $1–$75+ | $1–$50+ |
Which is more valuable?
Typical specimens of Caliche and Limestone trade in a similar range, around $10.
About Caliche
Caliche is a hardened calcium carbonate-rich soil or sediment layer, also called calcrete or hardpan, common in arid and semi-arid regions.
About Limestone
Limestone is a sedimentary rock composed mainly of calcium carbonate. It often contains fossils and is the precursor to marble.
Caliche vs Limestone FAQ
Is Caliche 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, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
How can you tell Caliche from Limestone?
Both sit near Mohs 3, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. Streak color differs: Caliche leaves a white to pale tan streak on unglazed porcelain, Limestone leaves white. They overlap in white, brown, and gray, but Limestone also comes in yellow.
Which is harder, Caliche or Limestone?
They are about equally hard, both near Mohs 3.
Which is more valuable, Caliche or Limestone?
Typical specimens of Caliche and Limestone trade in a similar range, around $10.
