sedimentary

Red Sandstone

Arenite (SiO2 with Fe2O3)

Hardness: 6-7 (Mohs scale); Color: Red, reddish-brown; Luster: Dull, earthy; Crystal structure: Clastic/Granular; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 (Mohs scale)
Color: Red, reddish-brown
Luster: Dull, earthy

Identified July 9, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale); Color: Red, reddish-brown; Luster: Dull, earthy; Crystal structure: Clastic/Granular; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. The red color is derived from iron oxide (hematite) coating the grains, typical of arid continental environments.

Uses & applications

Commonly used as a building material, paving stone, and in glass manufacturing if highly pure. Frequently used for decorative garden landscaping.

Geological facts

Red sandstone formations like those in Sedona, Arizona and the Grand Canyon are iconic geological landmarks. They often record ancient desert or river environments from millions of years ago.

Field identification & locations

Identified by its gritty sandpaper-like texture and reddish tint. Commonly found in riverbeds, beaches, and desert regions. Collectors should look for distinct layering or cross-bedding features.