sedimentary

Red Sandstone

Arenite (Iron-rich)

Hardness: 6-7 (Mohs); Color: Red, reddish-brown, tan; Luster: Dull, earthy; Crystal structure: Clastic (grainy texture); Cleavage: None; Specific gravity: 2.2-2.8

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

Identified July 18, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs); Color: Red, reddish-brown, tan; Luster: Dull, earthy; Crystal structure: Clastic (grainy texture); Cleavage: None; Specific gravity: 2.2-2.8

Formation & geological history

Formed from the lithification of sand-sized grains (mostly quartz) in arid desert environments or river basins. The red color comes from iron oxide (hematite) coating the grains. Typical age ranges from Paleozoic to Mesozoic era.

Uses & applications

Commonly used in construction for building stone, pavers, and decorative landscaping. High-quality varieties are used for architectural facades.

Geological facts

Famous structures like the Grand Canyon or the 'Red Rocks' of Sedona and Colorado are made of this material. The color indicates oxygen was present during its formation, rusting the iron minerals.

Field identification & locations

Identify by its gritty, sandpaper-like feel and visible grains. Found globally but especially prolific in the Southwestern United States and Northern Europe. Collectors look for unique banding or fossils within layers.