sedimentary

Sandstone

Arenite (composed primarily of SiO2)

Hardness: 6-7 (Mohs scale); Color: Tan, brown, yellow; Luster: Dull/Earthy; Texture: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 (Mohs scale)
Color: Tan, brown, yellow
Luster: Dull/Earthy

Identified July 14, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale); Color: Tan, brown, yellow; Luster: Dull/Earthy; Texture: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments (clasts). It typically forms in river deltas, deserts, or beaches over millions of years through lithification.

Uses & applications

Primarily used as a construction material (building stone), as a decorative stone for landscaping, and in the manufacturing of glass and grindstones.

Geological facts

Sandstone makes up about 20-25% of all sedimentary rocks on Earth. The famous Red Rocks of Colorado and the Antelope Canyon in Arizona are massive sandstone formations.

Field identification & locations

Identify in the field by its sandpaper-like gritty texture; grains should be visible to the naked eye. It is found globally in sedimentary basins. Collectors often look for colorful banding or fossil inclusions.