sedimentary

Sandstone

Arenite (Silicon Dioxide, SiO2 based)

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

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

Identified June 7, 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, brown, or buff; Luster: Dull/Earthy; Crystal Structure: Clastic texture with sand-sized grains; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed from the accumulation and cementation of mineral particles or rock fragments (sand) in marine or terrestrial environments over millions of years. This specimen appears weathered/rounded.

Uses & applications

Used extensively in construction (as a building stone), glass manufacturing, and as a reservoir rock for oil and natural gas.

Geological facts

Sandstone is highly porous and acts as a natural filter for groundwater. It often preserves fossils and ripple marks from ancient riverbeds or sea floors.

Field identification & locations

Identify by its gritty texture (feels like sandpaper) and visible grains. Commonly found in desert basins, river deltas, and coastal cliffs. Look for layering (stratification) in larger outcrops.