sedimentary

Red Sandstone

Quartzose Sandstone (SiO2)

Hardness: 6-7 on Mohs scale; Color: Red to reddish-brown due to iron oxide cement; Luster: Dull or earthy; Crystal structure: Clastic (composed of rounded quartz sand grains cemented together); Cleavage: None; Specific Gravity: 2.2 - 2.8.

Hardness: 6-7 on Mohs scale
Color: Red to reddish-brown due to iron oxide cement
Luster: Dull or earthy

Identified July 28, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the accumulation, compaction, and cementation of mineral particles or rock fragments, typically in desert, fluvial, or shallow marine environments over millions of years.

Uses & applications

Used heavily in construction as building stone, dimension stone, paving, and decorative aggregate.

Geological facts

The characteristic red color comes from hematite or goethite acting as a natural cement between the sand grains. Famous geological formations like Monument Valley and Zion National Park are composed largely of red sandstone.

Field identification & locations

Easily identified by its gritty, sandpaper-like texture and distinct red or brown coloration. Common worldwide wherever ancient deserts or river systems existed.