sedimentary

Sandstone (Water-worn Cobble)

Arenite (SiO2 based)

AI-generated identification · may be incorrect

Hardness: 6-7 (on Mohs scale); Color: Tan to reddish-brown; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None; Texture: Gritty like sandpaper.

Hardness: 6-7 (on Mohs scale)
Color: Tan to reddish-brown
Luster: Dull/Earthy

Identified April 20, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (on Mohs scale); Color: Tan to reddish-brown; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None; Texture: Gritty like sandpaper.

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains (mostly quartz) in riverbeds, beaches, or deserts. This specific specimen has been rounded and smoothed by hydraulic action in a river or coastal environment.

Uses & applications

Commonly used in construction, as a building stone, for decorative landscaping (river rocks), and as an abrasive in industrial applications.

Geological facts

Sandstone preserves a history of the Earth's surface, often containing ripples from ancient water currents or cross-bedding from ancient sand dunes. It is also one of the most common reservoir rocks for groundwater and oil.

Field identification & locations

Identify in the field by its distinctive 'sandpaper' feel and visible grain structure. Commonly found in riverbeds, along coastlines, and in sedimentary basins worldwide.