sedimentary

Sandstone

Clastic Sedimentary Rock (primarily Quartz, SiO2)

AI-generated identification · may be incorrect

Hardness: 6-7 (individual grains); Color: Tan, brown, or earthy yellow; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: 2.0-2.6

Hardness: 6-7 (individual grains)
Color: Tan, brown, or earthy yellow
Luster: Dull/Earthy

Identified April 13, 2026More sedimentary →

Explore Sandstone in the encyclopedia →

Identify your own rocks.

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

App Store Google Play

Physical properties

Hardness: 6-7 (individual grains); Color: Tan, brown, or earthy yellow; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: 2.0-2.6

Formation & geological history

Formed through the accumulation and cementation of mineral particles or rock fragments (clastic) of silica and/or feldspar. This specimen appears to be a river-worn pebble, likely millions of years old, shaped by fluvial transport.

Uses & applications

Used primarily in construction (building stone, flagstone), as an abrasive material, and as a reservoir rock for oil and natural gas.

Geological facts

Sandstone makes up about 20-25% of all sedimentary rocks on Earth. Notable formations include the red rocks of the Grand Canyon and the Nabataean architecture in Petra.

Field identification & locations

Identify in the field by its 'sandpaper' feel and visible grains. Often found in riverbeds, deserts, and coastal areas. Collectors look for unique banding or fossils within the layers.