metamorphic
Quartzite Pebble
Quartzite (SiO2)
Hardness: 7 (Mohs scale); Color: White, cream, or light pink with orange-iron staining; Luster: Vitreous to waxy; Structure: Non-foliated, granular; Cleavage: None (conchoidal fracture)
- Hardness
- 7 (Mohs scale)
- Color
- White, cream, or light pink with orange-iron staining
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 (Mohs scale); Color: White, cream, or light pink with orange-iron staining; Luster: Vitreous to waxy; Structure: Non-foliated, granular; Cleavage: None (conchoidal fracture)
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone under intense heat and pressure, typically in orogenic belts. This specific specimen reflects water-worn rounding from fluvial or glacial transport.
Uses & applications
Used as construction aggregate, high-purity silica source for glass making, decorative landscaping stone, and architectural surfacing.
Geological facts
Quartzite is so tough that it often outlasts the surrounding rocks during erosion, often forming the caps of ridges and mountains. It is harder than a steel knife and will easily scratch glass.
Field identification & locations
Identify by its hardness (cannot be scratched by steel) and its sugary, crystalline texture. It is extremely common in gravel pits, riverbeds, and as decorative stone in driveways.
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