sedimentary

Sandstone

Arenite (SiO2 based)

Hardness: 6-7 on Mohs scale; Color: Tan, yellow, or light brown; Luster: Dull/Earthy; Crystal Structure: Clastic texture with sand-sized grains; Cleavage: None; Specific Gravity: 2.2-2.8

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

Identified July 5, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale; Color: Tan, yellow, or light brown; Luster: Dull/Earthy; Crystal Structure: Clastic texture with sand-sized grains; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments, typically through wind or water action in deserts, riverbeds, or beaches over millions of years.

Uses & applications

Extensively used in construction for paving, building stone, and decorative features. It is also an important reservoir rock for groundwater and petroleum.

Geological facts

Sandstone can be nearly any color, but the most common are tan, brown, yellow, red, grey, pink, white, and black. It is one of the most common types of sedimentary rock found in the Earth's crust.

Field identification & locations

Identifiable by its gritty, sandpaper-like feel and visible grains. Common in arid regions and coastal cliffs. To identify, check if it scratches glass (quartz-rich) and feel for a rough texture.