sedimentary

Sandstone

Arenite (SiO2 dominant)

AI-generated identification · may be incorrect

Hardness: 6-7 (if quartz-based); Color: Tan, brown, reddish-brown; Luster: Dull/Earthy; Texture: Granular like sandpaper; Structure: Clastic

Hardness: 6-7 (if quartz-based)
Color: Tan, brown, reddish-brown
Luster: Dull/Earthy

Identified July 17, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (if quartz-based); Color: Tan, brown, reddish-brown; Luster: Dull/Earthy; Texture: Granular like sandpaper; Structure: Clastic

Formation & geological history

Formed through the accumulation, compaction, and cementation of sand-sized mineral grains or rock fragments, typically in desert, river, or coastal environments over millions of years.

Uses & applications

Extensively used in construction for flagstone, paving, and building facades; historically used for grindstones and architectural sculptures.

Geological facts

Sandstone records historical water and wind patterns through features like cross-bedding. It is also one of the most common reservoir rocks for underground water and oil.

Field identification & locations

Identify in the field by its gritty, sand-like texture that may rub off slightly. Often found in layered outcrops or as rounded river/desert cobbles. Check for visible bedding planes.