sedimentary

Sandstone

Arenite

Hardness: 6-7 Mohs; Color: Brown, tan, reddish; Luster: Dull/Matte; Structure: Clastic; Cleavage: None; Specific Gravity: 2.2-2.8. Feels gritty like sandpaper.

Hardness: 6-7 Mohs
Color: Brown, tan, reddish
Luster: Dull/Matte

Identified June 9, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Brown, tan, reddish; Luster: Dull/Matte; Structure: Clastic; Cleavage: None; Specific Gravity: 2.2-2.8. Feels gritty like sandpaper.

Formation & geological history

Formed from the accumulation of sand-sized mineral particles or rock fragments, cemented together by silica, calcium carbonate, or iron oxide over millions of years in riverbeds, deserts, or marine environments.

Uses & applications

Widely used as a building material, decorative stone in landscaping, used in the manufacture of glass, and occasionally for grindstones or whetstones.

Geological facts

Sandstone can preserve fossilized footprints and ripple marks from ancient water currents. It is one of the most common sedimentary rocks and makes up about 10-25% of the sedimentary rocks on Earth.

Field identification & locations

Identified by its gritty texture and visible sand grains. Widely found in canyons, beaches, and desert outcrops. For collectors, look for unique colors or cross-bedding layers.