sedimentary

Sandstone

Arenite

Hardness: 6-7 (Mohs); Color: Reddish-brown, tan; Luster: Dull/Earthy; Crystal structure: Granular/Clastic texture; Cleavage: None; Specific gravity: 2.2-2.8

Hardness: 6-7 (Mohs)
Color: Reddish-brown, tan
Luster: Dull/Earthy

Identified July 2, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs); Color: Reddish-brown, tan; Luster: Dull/Earthy; Crystal structure: Granular/Clastic texture; Cleavage: None; Specific gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cemented lithification of sand-sized mineral particles or rock fragments, typically in riverbeds, deserts, or coastal environments over millions of years.

Uses & applications

Used primarily in building and construction, as a source for glass sand, and sometimes for decorative aggregate or grindstones.

Geological facts

Sandstone is of great importance to geologists because it helps determine the flow of ancient currents and identifies paleo-environments. It accounts for about 20% of all sedimentary rocks on Earth.

Field identification & locations

Identified in the field by its gritty texture (feels like sandpaper) and visible grains. Often found in outcrops with distinct layering (bedding). It is common in the southwestern United States and arid regions worldwide.