sedimentary

Sandstone (Quartzose Sandstone)

Arenite (SiO2 based)

AI-generated identification · may be incorrect

Hardness: 6-7 Mohs; Color: Brownish-red to tan; Luster: Dull/Earthy; Crystal structure: Clastic (granular); Texture: Gritty like sandpaper; Cleavage: None

Hardness: 6-7 Mohs
Color: Brownish-red to tan
Luster: Dull/Earthy

Identified July 19, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Brownish-red to tan; Luster: Dull/Earthy; Crystal structure: Clastic (granular); Texture: Gritty like sandpaper; Cleavage: None

Formation & geological history

Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments, typically deposited in river beds, deserts, or beaches over millions of years.

Uses & applications

Commonly used as a building material, pavers, decorative stones, and as a reservoir rock for oil and natural gas in the energy industry.

Geological facts

This specimen is a water-worn river cobble. Because it is porous, sandstone can hold significant amounts of water or oil in the gaps between its grains.

Field identification & locations

Identified by its gritty feel and visible sand grains. It is very common in sedimentary basins worldwide. In the field, look for layering (bedding) and test the grit with your fingernail.