sedimentary

Sandstone

Arenite (SiO2 primarily)

Mohs Hardness: 6.0-7.0 (depending on cementing material); Color: Tan, beige, or gray with visible grains; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None/Grainy fracture; Specific Gravity: 2.2-2.8

Hardness: 6
Color: Tan, beige, or gray with visible grains
Luster: Dull/Earthy

Identified June 19, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed via the accumulation and lithification of sand-sized mineral particles or rock fragments, typically in river beds, beaches, or deserts over millions of years. This specimen appears weathered and water-worn.

Uses & applications

Commonly used in construction as a building material and decorative stone, for grinding and sharpening tools, and as a reservoir rock for petroleum and groundwater.

Geological facts

Sandstone represents about 20% of all sedimentary rocks on Earth. The Great Sphinx of Giza was carved directly from a natural formation of sandstone and limestone.

Field identification & locations

Identified by its gritty 'sandpaper' feel. Commonly found in coastal areas, riverbanks, and desert basins. If it scratches glass, it likely has high quartz content.