sedimentary

Sandstone

Arenite (SiO2 based)

Hardness: 6-7 (if quartz-based); Color: Tan, brown, or reddish; Luster: Dull or earthy; Texture: Gritty like sandpaper; Structure: Clastic

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

Identified July 10, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (if quartz-based); Color: Tan, brown, or reddish; Luster: Dull or earthy; Texture: Gritty like sandpaper; Structure: Clastic

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments over millions of years, typically in river beds, beaches, or deserts.

Uses & applications

Commonly used as a building material, in paving, for glass manufacture (if high silica), and as a reservoir rock for oil and gas.

Geological facts

Sandstone makes up about 20 to 25 percent of all sedimentary rocks on Earth and often preserves fossils or ancient ripple marks from water currents.

Field identification & locations

Identify by its distinct sandy feel when rubbed; it is found globally in sedimentary basins. Collectors often look for colorful banding or fossil inclusions.