sedimentary

Red Sandstone

Arenite with iron oxide (Hematite) cement

AI-generated identification · may be incorrect

Hardness: 6-7 on Mohs scale; Color: Reddish-brown to tan; Luster: Dull/Earthy; Crystal structure: Granular (Clastic texture); Specific gravity: 2.2-2.8

Hardness: 6-7 on Mohs scale
Color: Reddish-brown to tan
Luster: Dull/Earthy

Identified June 17, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale; Color: Reddish-brown to tan; Luster: Dull/Earthy; Crystal structure: Granular (Clastic texture); 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 suggests deposition in an oxygen-rich environment where iron minerals oxidized (rusted). Often found in ancient riverbeds, deserts, and floodplains.

Uses & applications

Used extensively in construction as a building material, decorative stone for landscaping, and occasionally as a source of silica for glass manufacturing.

Geological facts

Red sandstone formations comprise iconic landscapes like the Grand Canyon and the 'Red Rocks' of Colorado. It often contains microfossils or ripple marks from ancient water currents.

Field identification & locations

Identified by its gritty feel like sandpaper and its distinct reddish hue. It is commonly found in sedimentary basins and arid regions globally. Collectors look for unique weathering patterns or fossil inclusions.