sedimentary

Sandstone (with Iron Staining)

Clastic sedimentary rock (High Silica / Iron Oxide)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale); Color: Brownish-tan to reddish-brown; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: approx. 2.2-2.8

Hardness: 6-7 (Mohs scale)
Color: Brownish-tan to reddish-brown
Luster: Dull/Earthy

Identified April 6, 2026More sedimentary →

Explore Sandstone (with Iron Staining) 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 (Mohs scale); Color: Brownish-tan to reddish-brown; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: approx. 2.2-2.8

Formation & geological history

Formed from the accumulation and cementation of sand-sized mineral grains, primarily quartz and feldspar, often in deserts, riverbeds, or coastal environments. The color suggests iron-rich groundwater precipitation (limonite or hematite) during or after lithification.

Uses & applications

Commonly used as a building material, paving stone, and abrasive. Because it is porous, it often acts as an aquifer for water or a reservoir for oil and gas.

Geological facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. The famous 'Red Rocks' in Colorado and the Treasury at Petra are carved out of or composed of sandstone layers.

Field identification & locations

Identify by its gritty, 'sandpaper' feel and visible grains. Often shows layering or cross-bedding. Common in areas with exposed sedimentary basins or near ancient coastlines.