sedimentary

Weathered sandstone pebble

Clastic sandstone, predominantly quartz (SiO₂) grains cemented by silica, calcite, or iron oxides

AI-generated identification · may be incorrect

Typically Mohs 6–7 for quartz grains, though porous surfaces feel softer; tan to reddish-brown, dull earthy luster, visibly granular texture, and no obvious cleavage. The rounded shape and surface pits indicate abrasion and weathering.

Identified August 12, 2026More sedimentary →

Explore Weathered 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

Formation & geological history

Formed when sand accumulated, compacted, and cemented in ancient rivers, beaches, dunes, or shallow marine environments; its precise geological age cannot be determined from the image. Later erosion rounded it into a pebble.

Uses & applications

Used as building and paving stone, aggregate, landscaping material, and occasionally as a decorative specimen; this example has little commercial or collector value.

Geological facts

The reddish coloration commonly comes from iron-oxide coatings, while uneven pits may reflect differential cementation or weathered grains. It could also be a fine-grained related rock such as quartz-rich siltstone.

Field identification & locations

Look for sand-sized grains, gritty texture, sedimentary layering, and a lack of crystalline interlocking texture; a hand lens and dilute acid test can help distinguish carbonate cement. Sandstone pebbles occur widely in streambeds, beaches, deserts, and glacial deposits.