sedimentary

Sandstone

Arenite (composed primarily of SiO2)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale); Color: Tan, brown, yellow, or reddish; Luster: Dull/Earthy; Crystal structure: Clastic (grainy texture); Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 (Mohs scale)
Color: Tan, brown, yellow, or reddish
Luster: Dull/Earthy

Identified April 11, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale); Color: Tan, brown, yellow, or reddish; Luster: Dull/Earthy; Crystal structure: Clastic (grainy texture); Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of mineral particles or rock fragments (clasts) the size of sand. Most sandstones are formed in river, lake, or ocean environments over millions of years.

Uses & applications

Extensively used as a building material, paving stone, and decorative facades. It is also used in the glass industry and as a reservoir rock for water and petroleum.

Geological facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. Famous formations include the Grand Canyon and the red rocks of Sedona, Arizona.

Field identification & locations

Identify by the gritty, sandpaper-like feel and visible grains. Often displays visible layering or cross-bedding. Found globally in deserts, riverbeds, and coastal regions.