sedimentary

Sandstone

Arenite (SiO2 dominant)

Hardness: 6-7 Mohs; Color: Greyish-white with subtle banding; Luster: Dull, earthy; Crystal structure: Granular clastic; Specific Gravity: 2.2-2.8

Hardness: 6-7 Mohs
Color: Greyish-white with subtle banding
Luster: Dull, earthy

Identified July 16, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Greyish-white with subtle banding; Luster: Dull, earthy; Crystal structure: Granular clastic; Specific Gravity: 2.2-2.8

Formation & geological history

Formed by the accumulation and cementation of sand-sized grains, typically quartz and feldspar, through the process of lithification over millions of years in marine or terrestrial environments.

Uses & applications

Commonly used as a building material, in paving, for decorative landscaping, and as an abrasive in industry; also acts as a primary reservoir for groundwater and petroleum.

Geological facts

Sandstone represents about 20-25% of all sedimentary rocks on Earth. It often preserves fossils of plants and animals that lived in the environment where the sand was deposited.

Field identification & locations

Identify in the field by its sandpaper-like feel and visible grains. It is extremely common worldwide in canyons, riverbeds, and coastal regions. It may react with acid if the cementing agent is calcite.