sedimentary
River Gravel (Quartzite and Chert pebbles)
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 6.5-7 on Mohs scale. Color: Tan, brown, gray, and cream. Luster: Dull to waxy. Structure: Microcrystalline or granular. Cleavage: None, conchoidal fracture.
- Hardness
- 6
- Color
- Tan, brown, gray, and cream
- Luster
- Dull to waxy
Identified More sedimentary →
Explore River Gravel (Quartzite and Chert pebbles) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6.5-7 on Mohs scale. Color: Tan, brown, gray, and cream. Luster: Dull to waxy. Structure: Microcrystalline or granular. Cleavage: None, conchoidal fracture.
Formation & geological history
Formed through the weathering and erosion of larger rock formations, transported by water and naturally tumbled into smooth pebbles over thousands of years.
Uses & applications
Commonly used in landscaping, concrete aggregate, road construction, and decorative garden paths.
Geological facts
These pebbles are silica-rich, making them extremely resistant to chemical weathering. They often survive long journeys from mountains to river basins.
Field identification & locations
Identify by their rounded shape and inability to be scratched by a steel knife. Commonly found in riverbeds, glacial deposits, and beaches.
More like this
Other sedimentary specimens
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
sedimentary
Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary