sedimentary

Sandstone

Arenite (SiO2 primarily)

Hardness: 6-7 Mohs; Color: Tan, beige, or brown with distinct horizontal bedding; Luster: Dull/Earthy; Texture: Gritty like sandpaper; Structure: Clastic

Hardness: 6-7 Mohs
Color: Tan, beige, or brown with distinct horizontal bedding
Luster: Dull/Earthy

Identified June 6, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Tan, beige, or brown with distinct horizontal bedding; Luster: Dull/Earthy; Texture: Gritty like sandpaper; Structure: Clastic

Formation & geological history

Formed via the accumulation and cementation of sand-sized mineral grains (primarily quartz and feldspar) in environments like deserts, river beds, or beaches over millions of years.

Uses & applications

Extensively used in construction, paving, as a decorative building stone, and for manufacturing glass and sharpeners.

Geological facts

Sandstone represents about 20% of all sedimentary rocks on Earth. The famous red rocks of the Grand Canyon are primarily composed of various sandstone layers.

Field identification & locations

Identify by its gritty texture and visible layering (stratification). Can be found globally in outcrops, riverbeds, and coastal regions. Avoid using acid tests as it won't react like limestone.