sedimentary

Sandstone

Arenite (primarily SiO2)

Hardness (Mohs scale): 6-7 (individual grains), visible granular texture feels gritty like sandpaper, color: tan/brown, luster: dull, cleavage: none, specific gravity: 2.2-2.8

Color: tan/brown, luster: dull, cleavage: none, specific gravity: 2
Luster: dull, cleavage: none, specific gravity: 2

Identified July 19, 2026More sedimentary →

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Physical properties

Hardness (Mohs scale): 6-7 (individual grains), visible granular texture feels gritty like sandpaper, color: tan/brown, luster: dull, cleavage: none, specific gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of mineral particles or rock fragments of sand size (0.06 to 2 mm) in environments like deserts, river deltas, and beaches over millions of years.

Uses & applications

Widely used as an architectural building stone, in paving, as a source of high-purity silica for glassmaking, and for ornamental garden decor.

Geological facts

Sandstone makes up about 20% to 25% of all sedimentary rocks on Earth. It is porous and often serves as a primary reservoir for underground water (aquifers) or oil and gas.

Field identification & locations

Identify in the field by its sandpaper-like feel and visible grains. Often found in dramatic layered cliffs or as weathered river cobbles. Very common in the American Southwest and various coastal regions.