sedimentary

Sandstone

Arenite (SiO2 based)

Hardness: 6-7 Mohs; Color: Tan, beige, or light brown; Luster: Dull/Earthy; Crystal structure: Clastic (sand-sized grains); Cleavage: None.

Hardness: 6-7 Mohs
Color: Tan, beige, or light brown
Luster: Dull/Earthy

Identified June 23, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Tan, beige, or light brown; Luster: Dull/Earthy; Crystal structure: Clastic (sand-sized grains); Cleavage: None.

Formation & geological history

Formed by the accumulation and cementation of mineral particles or rock fragments (sand) in marine or terrestrial environments such as river beds, deserts, or beaches over millions of years.

Uses & applications

Widely used for construction, decorative stone in masonry, as a reservoir rock for oil and gas, and for aquifers.

Geological facts

Sandstone represents about 20% of all sedimentary rocks on Earth. Its porosity makes it one of the most important rocks for groundwater storage.

Field identification & locations

Identify by its gritty, sandpaper-like feel and visible small grains. Found in desert regions, ancient river beds, and canyons. Avoid confusing with quartzite, which is much harder and lacks the gritty surface.