sedimentary

Sandstone

Arenite (SiO2 primarily)

Hardness: 6-7 on Mohs scale; Color: Tan, brown, yellow, red; Luster: Dull/Earthy; Texture: Granular, feels like sandpaper; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 on Mohs scale
Color: Tan, brown, yellow, red
Luster: Dull/Earthy

Identified July 14, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale; Color: Tan, brown, yellow, red; Luster: Dull/Earthy; Texture: Granular, feels like sandpaper; 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 common in desert environments or ancient sea beds, spanning all geological ages.

Uses & applications

Widely used as a building material, grit for sharpening blades, and as a reservoir rock for oil, gas, and groundwater in the energy sector.

Geological facts

Sandstone makes up about 10-20% of Earth's sedimentary rock. Its color is often determined by the presence of iron oxides like hematite or limonite.

Field identification & locations

Identifiable by its gritty texture and visible bedding planes. Common globally; collectors look for 'picture sandstone' with unique patterns. Found in canyons and riverbanks.