Comparison · Metamorphic Rocks
Marble vs Quartzite
Marble and Quartzite are easy to confuse because both are metamorphic rocks. Quartzite is harder (Mohs 7) than Marble (Mohs 3.5), so Quartzite will scratch Marble and not the other way round. A steel knife blade (Mohs 5.5) scratches it; a copper coin does not. Below is a side-by-side comparison of their properties and the quick tests that separate them.
Key differences between Marble and Quartzite
- Quartzite is harder (Mohs 7) than Marble (Mohs 3.5), so Quartzite will scratch Marble and not the other way round. A steel knife blade (Mohs 5.5) scratches it; a copper coin does not.
- Hold a thin edge to the light: Marble is translucent, Quartzite is Opaque.
- They overlap in white, gray, and pink, but Marble also comes in green and black and Quartzite also comes in red and yellow.
Marble vs Quartzite properties
| Property | Marble | Quartzite |
|---|---|---|
| Type | Metamorphic Rocks | Metamorphic Rocks |
| Mohs hardness | 3.5 | 7 |
| Luster | vitreous | Vitreous to sugary/granular |
| Streak | White | — |
| Transparency | translucent | Opaque |
| Specific gravity | 2.7 | 2.6–2.7 |
| Crystal system | varies | — |
| Common colors | White, Gray, Pink, Green, Black | White, Gray, Pink, Reddish, Yellow |
| Rarity | common | common |
| Typical specimen value | $5–$500+ | $1–$75+ |
Which is more valuable?
Marble is usually the more valuable of the two: a typical collector specimen runs about $50 against $10 for Quartzite, and premium Marble can reach $500 or more.
About Marble
Marble is a metamorphic rock composed of recrystallized carbonate minerals. It has been used for sculpture and architecture since ancient times.
About Quartzite
Quartzite is a hard metamorphic rock formed by the recrystallization of quartz sandstone under heat and pressure, fusing individual quartz grains into an interlocking mosaic so tightly bonded that fractures cut through the grains themselves rather than around them. This distinguishes true metamorphic quartzite from sedimentary orthoquartzite, a well-cemented sandstone that can look superficially similar. Its exceptional hardness and resistance to weathering make it a common ridge-forming rock in many mountain ranges.
Marble vs Quartzite FAQ
Is Marble the same as Quartzite?
No. Both are metamorphic rocks, but they are distinct rock types with different hardness, streak or luster. Quartzite is harder (Mohs 7) than Marble (Mohs 3.5), so Quartzite will scratch Marble and not the other way round. A steel knife blade (Mohs 5.5) scratches it; a copper coin does not.
How can you tell Marble from Quartzite?
Quartzite is harder (Mohs 7) than Marble (Mohs 3.5), so Quartzite will scratch Marble and not the other way round. A steel knife blade (Mohs 5.5) scratches it; a copper coin does not. Hold a thin edge to the light: Marble is translucent, Quartzite is Opaque. They overlap in white, gray, and pink, but Marble also comes in green and black and Quartzite also comes in red and yellow.
Which is harder, Marble or Quartzite?
Quartzite is harder: Mohs 7 against Mohs 3.5 for Marble.
Which is more valuable, Marble or Quartzite?
Marble is usually the more valuable of the two: a typical collector specimen runs about $50 against $10 for Quartzite, and premium Marble can reach $500 or more.
