sedimentary

Sandstone

Arenite (SiO2 based)

Hardness: 6-7 (Mohs); Color: Tan, brown, or buff; Luster: Dull/Earthy; Crystal Structure: Clastic; Cleavage: None; Specific Gravity: 2.2-2.8.

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

Identified June 14, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs); Color: Tan, brown, or buff; Luster: Dull/Earthy; Crystal Structure: Clastic; Cleavage: None; Specific Gravity: 2.2-2.8.

Formation & geological history

Formed from the accumulation and cementation of sand-sized grains, typically mineral particles or rock fragments like quartz and feldspar, in river, desert, or marine environments.

Uses & applications

Widely used as a construction material for building, paving, and decorative stonework; also used for making grindstones and in the glass manufacturing industry.

Geological facts

Sandstone makes up about 20-25% of all sedimentary rocks on Earth. The famous red rock formations in Sedona, Arizona and the Grand Canyon are primarily sandstone.

Field identification & locations

Identify in the field by its gritty, sandpaper-like texture and visible layering (bedding). It is found globally in sedimentary basins. Collectors often look for colorful banding or fossil inclusions.