sedimentary

Sandstone

Arenite (SiO2 based typically)

Hardness: 6-7 Mohs; Color: Tan, beige, brown; Luster: Dull/Earthy; Crystal structure: Clastic (sand-sized grains); Cleavage: None; Specific gravity: 2.2-2.8

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

Identified June 24, 2026More sedimentary →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 6-7 Mohs; Color: Tan, beige, brown; Luster: Dull/Earthy; Crystal structure: Clastic (sand-sized grains); Cleavage: None; Specific gravity: 2.2-2.8

Formation & geological history

Formed from the accumulation of sand-sized mineral particles or rock fragments, cemented together by silica, calcium carbonate, or iron oxide over millions of years in desert, river, or ocean environments.

Uses & applications

Extensively used as a building material, paving stone, in the production of glass, and as a reservoir rock for petroleum and water.

Geological facts

Sandstone represents about 20% of all sedimentary rocks on Earth. The famous red rocks of the Grand Canyon and Petra in Jordan are primarily composed of sandstone.

Field identification & locations

Identify by its gritty texture (feels like sandpaper) and visible sand grains. Found globally in sedimentary basins. Collectors look for unique banding or fossil inclusions.