sedimentary

Sandstone

Arenite (SiO2 based typically)

Hardness: 6-7 Mohs; Color: Tan, beige, off-white; Luster: Dull/Earthy; Crystal Structure: Clastic/Granular; Cleavage: None; Grains are sand-sized (0.06 to 2 mm).

Hardness: 6-7 Mohs
Color: Tan, beige, off-white
Luster: Dull/Earthy

Identified June 15, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Tan, beige, off-white; Luster: Dull/Earthy; Crystal Structure: Clastic/Granular; Cleavage: None; Grains are sand-sized (0.06 to 2 mm).

Formation & geological history

Sandstone forms from the accumulation of sand-sized mineral grains or rock fragments, cemented together by pressure and minerals like silica or calcite. It typically forms in river beds, beaches, or deserts.

Uses & applications

Used extensively in construction as a building material, for paving stones, and in the glass manufacturing industry if high in silica.

Geological facts

Sandstone is highly porous and often acts as a natural aquifer or reservoir for petroleum and natural gas. Some of the world's most famous rock art and carvings are found on sandstone walls.

Field identification & locations

Identify by its gritty, sandpaper-like feel and visible grains. It is extremely common worldwide, especially in arid regions like the American Southwest or coastal areas.