metamorphic
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
Hardness: 7 (Mohs scale); Color: White to off-white with yellowish iron staining; Luster: Vitreous to waxy; Structure: Granular/Crystalline; Cleavage: None; Specific Gravity: 2.63-2.65
- Hardness
- 7 (Mohs scale)
- Color
- White to off-white with yellowish iron staining
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 (Mohs scale); Color: White to off-white with yellowish iron staining; Luster: Vitreous to waxy; Structure: Granular/Crystalline; Cleavage: None; Specific Gravity: 2.63-2.65
Formation & geological history
Formed through the metamorphism of quartz-rich sandstone subjected to high heat and pressure. This specific specimen has been further shaped into a smooth, rounded 'river pebble' by hydraulic erosion in a stream or coastal environment.
Uses & applications
Used primarily as decorative landscaping stone, in construction as aggregate, and occasionally in glassmaking if high purity is maintained.
Geological facts
Quartzite is so tough that it often survives the weathering of all surrounding rocks. When a quartzite pebble breaks, it breaks across the quartz grains, unlike sandstone which breaks around them.
Field identification & locations
Identify by its hardness (it will easily scratch glass) and its sugary, crystalline texture under a lens. Commonly found in riverbeds, glacial deposits, and mountain ranges globally.
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