sedimentary

Red Sandstone

Arenite (Ferruginous Sandstone)

AI-generated identification · may be incorrect

Mohs hardness: 6 to 7; Color: brick-red, reddish-brown; Luster: dull/earthy; Crystal structure: clastic (sand-sized grains); Cleavage: none; Specific gravity: approx 2.0-2.6.

Hardness: 6 to 7
Color: brick-red, reddish-brown
Luster: dull/earthy

Identified May 5, 2026More sedimentary →

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Physical properties

Mohs hardness: 6 to 7; Color: brick-red, reddish-brown; Luster: dull/earthy; Crystal structure: clastic (sand-sized grains); Cleavage: none; Specific gravity: approx 2.0-2.6.

Formation & geological history

Formed by the accumulation and lithification of sand-sized silicate grains. The red color indicates the presence of iron oxide (hematite) deposited in terrestrial or shallow-marine environments during the compaction process.

Uses & applications

Commonly used in construction as a building material, for paving, decorative landscaping, and historical architecture. Finely ground sandstone is used in glass making.

Geological facts

Red sandstone is a primary component of many famous geological formations, such as the Red Rocks in Colorado and the 'Old Red Sandstone' seen across Great Britain.

Field identification & locations

Identify by its gritty, sand-like texture when rubbed. It can be found worldwide in riverbeds, deserts, and coastal cliffs. Red varieties are specific indicators of oxidizing environments.