Comparison · Silicate Minerals vs Metamorphic Rocks
Serpentine vs Soapstone
Serpentine and Soapstone are easy to confuse. Serpentine is harder (Mohs 3.5) than Soapstone (Mohs 1–2.5), so Serpentine 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 Serpentine and Soapstone
- Serpentine is harder (Mohs 3.5) than Soapstone (Mohs 1–2.5), so Serpentine will scratch Soapstone and not the other way round. A fingernail (Mohs 2.5) scratches it easily.
- Hold a thin edge to the light: Serpentine is translucent, Soapstone is Opaque.
- They overlap in green and white, but Serpentine also comes in yellow and black and Soapstone also comes in gray.
Serpentine vs Soapstone properties
| Property | Serpentine | Soapstone |
|---|---|---|
| Type | Silicate Minerals | Metamorphic Rocks |
| Mohs hardness | 3.5 | 1–2.5 |
| Luster | greasy | Greasy to pearly/waxy |
| Streak | White | White |
| Transparency | translucent | Opaque |
| Specific gravity | 2.6 | 2.6–2.8 |
| Crystal system | monoclinic | — |
| Common colors | Green, Yellowish green, Olive, Black, White | Gray, Green, White, Bluish gray |
| Rarity | common | common |
| Typical specimen value | $5–$250+ | $1–$75+ |
Which is more valuable?
Serpentine is usually the more valuable of the two: a typical collector specimen runs about $40 against $10 for Soapstone, and premium Serpentine can reach $250 or more.
About Serpentine
Serpentine is a group of green, magnesium-rich silicate minerals that includes antigorite, lizardite, and chrysotile. It commonly occurs as massive, greasy-feeling rock in mottled green tones and is the main component of the rock serpentinite.
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.
Serpentine vs Soapstone FAQ
Is Serpentine the same as Soapstone?
No. Serpentine is a silicate mineral while Soapstone is a metamorphic rock. Serpentine is harder (Mohs 3.5) than Soapstone (Mohs 1–2.5), so Serpentine will scratch Soapstone and not the other way round. A fingernail (Mohs 2.5) scratches it easily.
How can you tell Serpentine from Soapstone?
Serpentine is harder (Mohs 3.5) than Soapstone (Mohs 1–2.5), so Serpentine will scratch Soapstone and not the other way round. A fingernail (Mohs 2.5) scratches it easily. Hold a thin edge to the light: Serpentine is translucent, Soapstone is Opaque. They overlap in green and white, but Serpentine also comes in yellow and black and Soapstone also comes in gray.
Which is harder, Serpentine or Soapstone?
Serpentine is harder: Mohs 3.5 against Mohs 1–2.5 for Soapstone.
Which is more valuable, Serpentine or Soapstone?
Serpentine is usually the more valuable of the two: a typical collector specimen runs about $40 against $10 for Soapstone, and premium Serpentine can reach $250 or more.
