sedimentary
River Pebble (Quartzite/Chert)
Silicon Dioxide (SiO2)
Hardness: 6.5-7 (Mohs); Color: Tan/Cream with dark veins; Luster: Dull/Waxy; Structure: Microcrystalline; Cleavage: None/Conchoidal
- Hardness
- 6
- Color
- Tan/Cream with dark veins
- Luster
- Dull/Waxy
Identified More sedimentary →
Explore River Pebble (Quartzite/Chert) in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness: 6.5-7 (Mohs); Color: Tan/Cream with dark veins; Luster: Dull/Waxy; Structure: Microcrystalline; Cleavage: None/Conchoidal
Formation & geological history
Formed through the accumulation of silica-rich sediments or the metamorphism of sandstone, subsequently weathered and rounded by water transport in a river or beach environment.
Uses & applications
Primarily used in landscaping, construction aggregate, and as decorative stone in gardens or aquariums.
Geological facts
This specimen is a 'clast,' a piece of rock broken off from a larger mass and rounded by the abrasive action of water and sand over thousands of years.
Field identification & locations
Identify by its rounded, smooth texture and high hardness (it cannot be scratched by a steel knife). Commonly found in stream beds, river banks, and glacial deposits globally.
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
fossil
Shale
Shale (clastic sedimentary rock)
sedimentary
Brown Sandstone (River Rock)
Arenite
sedimentary
Cone-in-cone structure (Limestone)
Cone-in-cone structure (Secondary Sedimentary Structure)
sedimentary
Shale
Argillaceous sedimentary rock
sedimentary