sedimentary

Sandstone

Arenite (SiO2 primarily)

Mohs hardness: 6-7; Color: Brown, tan, reddish; Luster: Dull to earthy; Texture: Granular/clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7
Color: Brown, tan, reddish
Luster: Dull to earthy

Identified June 20, 2026More sedimentary →

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Physical properties

Mohs hardness: 6-7; Color: Brown, tan, reddish; Luster: Dull to earthy; Texture: Granular/clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed over millions of years through the accumulation, compaction, and cementation of sand-sized mineral grains or rock fragments (lithification), commonly in deserts, river beds, or ocean basins.

Uses & applications

Widely used as a construction material, for architectural stone, paving, grindstones for sharpening tools, and as a reservoir rock for petroleum and water.

Geological facts

Sandstone is highly porous and permeable, making it the most important type of rock for holding underground water aquifers and oil deposits. It often preserves fossils and ripple marks from ancient environments.

Field identification & locations

Check for a gritty, sandpaper-like feel. It can be found globally in outcrop locations and riverbeds. Collectors look for unique banding (wonderstone) or fossil inclusions.