Comparison · Metamorphic Rocks
Greenschist vs Soapstone
Greenschist and Soapstone are easy to confuse because both are metamorphic rocks. Greenschist is harder (Mohs 4.5) than Soapstone (Mohs 1–2.5), so Greenschist will scratch Soapstone and not the other way round. A fingernail (Mohs 2.5) scratches it easily. Below is a side-by-side comparison of their properties and the quick tests that separate them.
Key differences between Greenschist and Soapstone
- Greenschist is harder (Mohs 4.5) than Soapstone (Mohs 1–2.5), so Greenschist will scratch Soapstone and not the other way round. A fingernail (Mohs 2.5) scratches it easily.
- Streak color differs: Greenschist leaves a variable; usually pale greenish gray streak on unglazed porcelain, Soapstone leaves white.
- Hold a thin edge to the light: Greenschist is opaque, Soapstone is Opaque.
- They overlap in green, gray, and white, but Greenschist also comes in black.
Greenschist vs Soapstone properties
| Property | Greenschist | Soapstone |
|---|---|---|
| Type | Metamorphic Rocks | Metamorphic Rocks |
| Mohs hardness | 4.5 | 1–2.5 |
| Luster | silky | Greasy to pearly/waxy |
| Streak | Variable; usually pale greenish gray | White |
| Transparency | opaque | Opaque |
| Specific gravity | 2.9 | 2.6–2.8 |
| Crystal system | varies | — |
| Common colors | Green, Gray green, Dark green, Black, White | Gray, Green, White, Bluish gray |
| Rarity | common | common |
| Typical specimen value | $1–$75+ | $1–$75+ |
Which is more valuable?
Typical specimens of Greenschist and Soapstone trade in a similar range, around $10.
About Greenschist
Greenschist is a greenish metamorphic rock named for its common green minerals and schistose texture. It often looks green, gray-green, or dark green and may have a silky sheen.
About Soapstone
Soapstone, also called steatite, is a soft metamorphic rock composed predominantly of talc along with varying amounts of chlorite, mica, amphiboles, and carbonate minerals. Its defining trait is an extremely low hardness, around 1 on the Mohs scale, giving it the greasy, soap-like feel that inspired its common name. It forms through the metamorphism of ultramafic and other magnesium-rich rocks, often near serpentinite bodies.
Greenschist vs Soapstone FAQ
Is Greenschist the same as Soapstone?
No. Both are metamorphic rocks, but they are distinct rock types with different hardness, streak or luster. Greenschist is harder (Mohs 4.5) than Soapstone (Mohs 1–2.5), so Greenschist will scratch Soapstone and not the other way round. A fingernail (Mohs 2.5) scratches it easily.
How can you tell Greenschist from Soapstone?
Greenschist is harder (Mohs 4.5) than Soapstone (Mohs 1–2.5), so Greenschist will scratch Soapstone and not the other way round. A fingernail (Mohs 2.5) scratches it easily. Streak color differs: Greenschist leaves a variable; usually pale greenish gray streak on unglazed porcelain, Soapstone leaves white. Hold a thin edge to the light: Greenschist is opaque, Soapstone is Opaque.
Which is harder, Greenschist or Soapstone?
Greenschist is harder: Mohs 4.5 against Mohs 1–2.5 for Soapstone.
Which is more valuable, Greenschist or Soapstone?
Typical specimens of Greenschist and Soapstone trade in a similar range, around $10.
