sedimentary

Sandstone

Arenite (SiO2 primarily)

Hardness: 6-7 (Mohs scale), Color: tan, reddish-brown, or buff, Luster: dull to earthy, Crystal structure: granular clastic texture, Cleavage: none, Specific Gravity: 2.2-2.8

Identified June 7, 2026More sedimentary →

Identify your own rocks.

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

App Store Google Play

Physical properties

Hardness: 6-7 (Mohs scale), Color: tan, reddish-brown, or buff, Luster: dull to earthy, Crystal structure: granular clastic texture, Cleavage: none, Specific Gravity: 2.2-2.8

Formation & geological history

Formed over millions of years by the accumulation and cementation of mineral particles or rock fragments of sand size (0.0625 to 2 mm). Predominantly found in ancient riverbeds, deserts, and coastal environments.

Uses & applications

Extensively used as a building material, paving stone, and decorative stone. It is also used in glass manufacturing and as a reservoir rock for petroleum and natural gas.

Geological facts

Sandstone is highly porous and acts as a natural filter for groundwater. Red sandstones get their color from iron oxide (hematite) coatings on the sand grains.

Field identification & locations

Identified by its gritty 'sandpaper' feel. It is commonly found in sedimentary basins, canyons, and cliffs globally. Collectors look for unique banding or fossil inclusions.