sedimentary

Red Sandstone

Arenite (Ferruginous Sandstone)

Hardness: 6-7 on Mohs scale; Color: Reddish-brown to tan; Luster: Dull or earthy; Crystal structure: Clastic (composed of sand-sized grains); Cleavage: None; Specific gravity: 2.2 to 2.8

Hardness: 6-7 on Mohs scale
Color: Reddish-brown to tan
Luster: Dull or earthy

Identified May 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 on Mohs scale; Color: Reddish-brown to tan; Luster: Dull or earthy; Crystal structure: Clastic (composed of sand-sized grains); Cleavage: None; Specific gravity: 2.2 to 2.8

Formation & geological history

Formed by the accumulation of sand-sized mineral particles (usually quartz or feldspar) and later cemented together by iron oxides (hematite), which gives it the red color. Often formed in ancient river beds, deserts, or shallow marine environments.

Uses & applications

Widely used as a construction material for building facades, paving stones, and landscaping. Occasionally used in sculpture and as an abrasive in industry.

Geological facts

Red sandstone is the primary material used for many famous landmarks, such as the Red Fort in India and many of the classic formations in the American Southwest like those in Aridoma and Utah.

Field identification & locations

Identified in the field by its gritty, sand-paper-like texture and its tendency to rub off tiny grains of sand. Found globally in large terrestrial formations or 'Red Beds'. Collectors should look for distinct layering or cross-bedding.