sedimentary

Sandstone

Arenite (Siliclastic sedimentary rock)

AI-generated identification · may be incorrect

Hardness: 6-7 Mohs; Color: Brown, tan, or grey; Luster: Dull/Earthy; Texture: Granular/Sand-like; Porosity: High; Cleavage: None.

Hardness: 6-7 Mohs
Color: Brown, tan, or grey
Luster: Dull/Earthy

Identified July 12, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Brown, tan, or grey; Luster: Dull/Earthy; Texture: Granular/Sand-like; Porosity: High; Cleavage: None.

Formation & geological history

Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments over millions of years (typically Paleozoic to Cenozoic eras) in environments like deserts, river deltas, or beaches.

Uses & applications

Widely used as building stone, paving material, and in glass manufacturing if pure quartz; also used for sharpening tools and as a decorative stone in landscaping.

Geological facts

Sandstone makes up about 10-25% of all sedimentary rocks on Earth. Its high porosity makes it a critical reservoir rock for groundwater, oil, and natural gas.

Field identification & locations

Identified by its gritty, sand-like texture and visible grains. Common in arid regions and coastal cliffs. Collectors should check for bedding planes or cross-stratification features.