sedimentary

Sandstone

Arenite (SiO2 based)

Hardness: 6-7 Mohs; Color: Brown, tan, reddish-brown; Luster: Dull, earthy; Crystal structure: Granular (clastic); Common texture: Rough, sandpaper-like feel.

Hardness: 6-7 Mohs
Color: Brown, tan, reddish-brown
Luster: Dull, earthy

Identified June 23, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Brown, tan, reddish-brown; Luster: Dull, earthy; Crystal structure: Granular (clastic); Common texture: Rough, sandpaper-like feel.

Formation & geological history

Sandstone forms from the accumulation and cementation of mineral particles or rock fragments (sand) in riverbeds, deltas, or deserts over millions of years through the process of lithification.

Uses & applications

Commonly used in construction for tiles, structural stone, and monuments; also used as a reservoir rock for oil and natural gas in geological industries.

Geological facts

Sandstone can capture detailed fossils and ripple marks from ancient environments. Some of the world's most famous natural arches and canyons are carved entirely from sandstone.

Field identification & locations

Identified in the field by its gritty texture and visible sand grains. Found globally in sedimentary basins. Collectors often look for unique shapes or banding patterns.