sedimentary

Sandstone

Arenite (SiO2 primarily)

AI-generated identification · may be incorrect

Hardness: 6-7 Mohs; Color: Grey, tan, or brown; Luster: Dull/Earthy; Structure: Clastic, granular; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 Mohs
Color: Grey, tan, or brown
Luster: Dull/Earthy

Identified February 15, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Grey, tan, or brown; Luster: Dull/Earthy; Structure: Clastic, granular; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of mineral particles or rock fragments (sand) over millions of years in environments such as river beds, deserts, or ocean floors.

Uses & applications

Commonly used as a building material, in the manufacturing of glass, for road construction, and as a grit for grinding and sharpening tools.

Geological facts

Sandstone often preserves fossils and ripple marks from ancient environments, acting as a geological time capsule. It covers about 25% of the earth's sedimentary rock surface.

Field identification & locations

Identify by its gritty, sandpaper-like texture and visible layers (bedding). It is found worldwide, especially in arid regions like the American Southwest and coastal cliffs.