sedimentary

Sandstone Pebble

Arenite (SiO2 based)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs); Color: Tan, grey, beige; Luster: Dull or earthy; Crystal structure: Granular/Clastic; Cleavage: None; Rounded by water erosion.

Hardness: 6-7 (Mohs)
Color: Tan, grey, beige
Luster: Dull or earthy

Identified July 2, 2026More sedimentary →

Explore Sandstone Pebble in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 6-7 (Mohs); Color: Tan, grey, beige; Luster: Dull or earthy; Crystal structure: Granular/Clastic; Cleavage: None; Rounded by water erosion.

Formation & geological history

Formed from the accumulation and cementation of sand-sized grains, typically quartz and feldspar, in environments like rivers, beaches, or deserts. This pebble has been weathered and rounded by fluvial or coastal action.

Uses & applications

Commonly used as construction aggregate, for landscaping, and occasionally as a source for silica in industrial manufacturing.

Geological facts

Sandstone represents about 20-25% of all sedimentary rocks on Earth. This specific specimen is a 'river rock' or 'cobble' that has had its sharp edges smoothed away by millions of collisions in water.

Field identification & locations

Identified by its gritty sandpaper-like feel and visible layered or granular appearance. Commonly found in riverbeds, glacial tills, and along coastlines.