sedimentary

Sandstone

Arenite (primarily SiO2)

Hardness: 6-7 Mohs; Color: Tan, beige, or grey; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 Mohs
Color: Tan, beige, or grey
Luster: Dull/Earthy

Identified June 2, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Tan, beige, or grey; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of mineral particles or rock fragments of sand size (0.0625 to 2 mm). Usually deposited in river, lake, or ocean environments over millions of years.

Uses & applications

Widely used as a building material, masonry, road base, and in glass production when high in silica.

Geological facts

Sandstone makes up about 10 to 25 percent of all sedimentary rocks on Earth. It is porous and often acts as a natural filter or a reservoir for oil and groundwater.

Field identification & locations

Identify by its gritty, sandpaper-like texture and visible grains. Common in desert regions or near ancient coastal environments. Look for bedding planes or layers.