sedimentary

Sandstone

Arenite

Hardness: 6-7 on Mohs scale; Color: Tan, brown, or reddish; Luster: Dull/earthy; Crystal Structure: Clastic texture with sand-sized grains; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 on Mohs scale
Color: Tan, brown, or reddish
Luster: Dull/earthy

Identified July 19, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale; Color: Tan, brown, or reddish; Luster: Dull/earthy; Crystal Structure: Clastic texture with sand-sized grains; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed by the accumulation and lithification of mineral particles or rock fragments, usually quartz or feldspar, in river, desert, or ocean environments over millions of years.

Uses & applications

Primarily used as a building material, in decorative masonry, and for glass manufacturing if the quartz content is high.

Geological facts

Sandstone makes up about 10-20% of all sedimentary rocks on Earth and is an important reservoir for groundwater and oil due to its porosity.

Field identification & locations

Identify by its gritty, sandpaper-like feel and visible grain structure. Commonly found in riverbeds, canyons, and as landscaping stones (as seen in the background area).