sedimentary

Rounded sandstone pebble

Quartz-rich sandstone, composed mainly of SiO₂ grains cemented by silica, calcite, or iron oxides

AI-generated identification · may be incorrect

Typically Mohs hardness 6–7 for quartz grains, with variable whole-rock durability; tan to reddish-brown, dull to earthy luster, and visible fine grain or subtle bedding. It has no consistent cleavage and commonly shows rounded, water-worn surfaces.

Identified September 3, 2026More sedimentary →

Explore Rounded 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 into sandstone, likely millions to hundreds of millions of years ago; the specimen was later rounded by stream or shoreline abrasion.

Uses & applications

Used as building and paving stone, aggregate, and decorative material; attractive pebbles are collected or used in landscaping and crafts.

Geological facts

The darker reddish color commonly comes from iron-oxide coatings. Fine parallel bands may represent original sedimentary layering or differential weathering.

Field identification & locations

Identify it by gritty texture, visible sand grains, subdued earthy color, and possible layering; a glassy streak or acid fizz would suggest alternatives. Common in streambeds, beaches, desert washes, and eroding sandstone formations worldwide.