sedimentary

Sandstone

Arenite (SiO2 based)

Hardness: 6-7 Mohs; Color: Tan, brown, pinkish; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 Mohs
Color: Tan, brown, pinkish
Luster: Dull/Earthy

Identified May 31, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Tan, brown, pinkish; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed from the cementing of mineral particles or rock fragments of sand size (0.0625 to 2 mm) through lithification over millions of years in desert, river, or ocean environments.

Uses & applications

Widely used as a construction material for building masonry, road bases, and ornamental stone. It is also a key reservoir rock for petroleum and groundwater.

Geological facts

Sandstone accounts for approximately 20 to 25 percent 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 by its gritty, sandpaper-like feel and visible grains. Found globally in basins and sedimentary outcroppings. Collectors look for unique banding or fossil inclusions.