sedimentary

Sandstone

Arenite (SiO2 primarily)

Hardness: 6-7 (Mohs scale); Color: Tan, beige, or grey with a grainy texture; Luster: Dull or earthy; Crystal structure: Clastic/Granular; Cleavage: None; Specific Gravity: 2.2 - 2.8.

Hardness: 6-7 (Mohs scale)
Color: Tan, beige, or grey with a grainy texture
Luster: Dull or earthy

Identified March 26, 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 scale); Color: Tan, beige, or grey with a grainy texture; Luster: Dull or earthy; Crystal structure: Clastic/Granular; Cleavage: None; Specific Gravity: 2.2 - 2.8.

Formation & geological history

Formed by the accumulation and cementation of sand-sized grains (mostly quartz and feldspar) in environments like riverbeds, deserts, or ocean floors. Geological age varies from Precambrian to Holocene.

Uses & applications

Commonly used in construction as a building stone or road aggregate. Also used in glass making and as a source of industrial sand.

Geological facts

Sandstone makes up about 10-20% of Earth's sedimentary rock. It is a major reservoir for groundwater and petroleum due to its porosity.

Field identification & locations

Identify in the field by its sandpaper-like feel and visible grains. It is often found in riverbanks, canyons, and coastal bluffs. Collectors look for unique banding or fossils within the layers.