Comparison · Silicate Minerals
Pyrophyllite vs Serpentine
Pyrophyllite and Serpentine are easy to confuse because both are silicate minerals. Serpentine is harder (Mohs 3.5) than Pyrophyllite (Mohs 1.5), so Serpentine will scratch Pyrophyllite 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 Pyrophyllite and Serpentine
- Serpentine is harder (Mohs 3.5) than Pyrophyllite (Mohs 1.5), so Serpentine will scratch Pyrophyllite and not the other way round. A fingernail (Mohs 2.5) scratches it easily.
- They overlap in white, green, and yellow, but Pyrophyllite also comes in gray and brown and Serpentine also comes in black.
Pyrophyllite vs Serpentine properties
| Property | Pyrophyllite | Serpentine |
|---|---|---|
| Type | Silicate Minerals | Silicate Minerals |
| Mohs hardness | 1.5 | 3.5 |
| Luster | pearly | greasy |
| Streak | White | White |
| Transparency | translucent | translucent |
| Specific gravity | 2.8 | 2.6 |
| Crystal system | monoclinic | monoclinic |
| Common colors | White, Gray, Pale green, Yellow, Brown | Green, Yellowish green, Olive, Black, White |
| Rarity | common | common |
| Typical specimen value | $5–$150+ | $5–$250+ |
Which is more valuable?
Serpentine is usually the more valuable of the two: a typical collector specimen runs about $40 against $30 for Pyrophyllite, and premium Serpentine can reach $250 or more.
About Pyrophyllite
Pyrophyllite is a very soft aluminum silicate that closely resembles talc, with a pearly luster and a greasy feel. It typically forms foliated, fibrous, or radiating aggregates in metamorphic and hydrothermally altered rocks.
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.
Pyrophyllite vs Serpentine FAQ
Is Pyrophyllite the same as Serpentine?
No. Both are silicate minerals, but they are distinct species with different hardness, streak or luster. Serpentine is harder (Mohs 3.5) than Pyrophyllite (Mohs 1.5), so Serpentine will scratch Pyrophyllite and not the other way round. A fingernail (Mohs 2.5) scratches it easily.
How can you tell Pyrophyllite from Serpentine?
Serpentine is harder (Mohs 3.5) than Pyrophyllite (Mohs 1.5), so Serpentine will scratch Pyrophyllite and not the other way round. A fingernail (Mohs 2.5) scratches it easily. They overlap in white, green, and yellow, but Pyrophyllite also comes in gray and brown and Serpentine also comes in black.
Which is harder, Pyrophyllite or Serpentine?
Serpentine is harder: Mohs 3.5 against Mohs 1.5 for Pyrophyllite.
Which is more valuable, Pyrophyllite or Serpentine?
Serpentine is usually the more valuable of the two: a typical collector specimen runs about $40 against $30 for Pyrophyllite, and premium Serpentine can reach $250 or more.
