sedimentary
River Pebble (Quartzite/Chert)
Silicon Dioxide (SiO2)
Hardness: 6.5-7 (Mohs); Color: Tan/Brown; Luster: Matte to waxy; Structure: Microcrystalline; Surface: Smooth, rounded due to water erosion.
- Hardness
- 6
- Color
- Tan/Brown
- Luster
- Matte to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Tan/Brown; Luster: Matte to waxy; Structure: Microcrystalline; Surface: Smooth, rounded due to water erosion.
Formation & geological history
Formed through the accumulation and hardening of silica-rich sediments or the metamorphism of sandstone, subsequently weathered and shaped by river or stream action.
Uses & applications
Used in landscaping, construction aggregate, decorative garden features, and aquariums.
Geological facts
Pebbles are defined as rock fragments between 2 and 64 millimeters in diameter. Their smooth shape is the result of 'abrasion' during transport in moving water.
Field identification & locations
Identify by its rounded, smooth edges and high hardness (cannot be scratched by a steel nail). Found in riverbeds, beaches, and glacial deposits worldwide.
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