sedimentary

Sandstone

Arenite (SiO2 dominant)

Hardness: 6-7 (Mohs scale), Color: Brownish-tan to reddish-brown, Luster: Dull/Earthy, Crystal Structure: Clastic (sand-sized grains), Cleavage: None, Texture: Gritty/Sandpaper-like feel.

Identified June 17, 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: Brownish-tan to reddish-brown, Luster: Dull/Earthy, Crystal Structure: Clastic (sand-sized grains), Cleavage: None, Texture: Gritty/Sandpaper-like feel.

Formation & geological history

Formed over millions of years by the accumulation and cementation of sand-sized mineral grains or rock fragments. These typically deposit in riverbeds, deserts, or coastal environments and undergo lithification through pressure and mineral precipitation.

Uses & applications

Commonly used as a building material, paving stones, and for ornamental masonry. In industry, it is a significant reservoir rock for oil, gas, and groundwater.

Geological facts

Sandstone can exhibit beautiful banding called Liesegang rings. It is the primary material forming the famous 'wave' and 'antelope canyon' structures in the American Southwest.

Field identification & locations

Identify in the field by its gritty texture (feels like sandpaper) and visible layering. It is found globally in sedimentary basins. Collectors often look for colorful banding or fossil inclusions.