Comparison · Metamorphic Rocks
Amphibolite vs Schist
Amphibolite and Schist are easy to confuse because both are metamorphic rocks. Both sit near Mohs 5.5, 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 Amphibolite and Schist
- Both sit near Mohs 5.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
- Luster is different: Amphibolite is dull while Schist is vitreous to silky/glittery (mica-rich).
- Hold a thin edge to the light: Amphibolite is opaque, Schist is Opaque.
- They overlap in black, green, and gray, but Amphibolite also comes in white and red and Schist also comes in yellow.
Amphibolite vs Schist properties
| Property | Amphibolite | Schist |
|---|---|---|
| Type | Metamorphic Rocks | Metamorphic Rocks |
| Mohs hardness | 5.5 | 2.5–7 |
| Luster | dull | Vitreous to silky/glittery (mica-rich) |
| Streak | Variable; usually pale gray to white | — |
| Transparency | opaque | Opaque |
| Specific gravity | 3 | 2.7–3.0 |
| Crystal system | varies | — |
| Common colors | Black, Dark green, Gray, White, Red | Silver-gray, Golden (mica-rich), Green (chlorite/talc schist), Black |
| Rarity | common | common |
| Typical specimen value | $1–$75+ | $1–$75+ |
Which is more valuable?
Typical specimens of Amphibolite and Schist trade in a similar range, around $10.
About Amphibolite
Amphibolite is a dark, tough metamorphic rock made mostly of amphibole and plagioclase. It often appears black to dark green and may contain red garnets.
About Schist
Schist is a medium- to high-grade metamorphic rock defined by strong foliation from visible, aligned flakes of platy minerals like mica, giving it a pronounced sheen and a tendency to split along wavy surfaces. It forms through the continued metamorphism of shale, phyllite, or similar fine-grained rock under sustained heat and pressure, deep within mountain belts. Schist is typically named for its dominant mineral, such as mica schist, garnet schist, or chlorite schist.
Amphibolite vs Schist FAQ
Is Amphibolite the same as Schist?
No. Both are metamorphic rocks, but they are distinct rock types with different hardness, streak or luster. Both sit near Mohs 5.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead.
How can you tell Amphibolite from Schist?
Both sit near Mohs 5.5, so a scratch test alone will not separate them. Lean on luster, streak and heft instead. Luster is different: Amphibolite is dull while Schist is vitreous to silky/glittery (mica-rich). Hold a thin edge to the light: Amphibolite is opaque, Schist is Opaque.
Which is harder, Amphibolite or Schist?
Amphibolite is harder: Mohs 5.5 against Mohs 2.5–7 for Schist.
Which is more valuable, Amphibolite or Schist?
Typical specimens of Amphibolite and Schist trade in a similar range, around $10.
