sedimentary

Sandstone (Red/Brown Variety)

Arenite (composed primarily of SiO2 with Fe2O3 iron oxide inclusions)

AI-generated identification · may be incorrect

Hardness: 6-7 Mohs; Color: Brown to reddish-brown; Luster: Dull/Earthy; Crystal Structure: Clastic (sand grains); Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 Mohs
Color: Brown to reddish-brown
Luster: Dull/Earthy

Identified March 16, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Brown to reddish-brown; Luster: Dull/Earthy; Crystal Structure: Clastic (sand grains); Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed by the accumulation and lithification of sand-sized mineral particles or rock fragments. This specimen appears water-worn, suggesting a river or coastal environment. Deposits can range from millions to over lateral billions of years old.

Uses & applications

Used widely in construction as building stone, pavers, and decorative landscaping. High-purity varieties are crushed for glass manufacturing and industrial abrasives.

Geological facts

Red sandstone gets its distinct color from hematite (iron oxide) coating the quartz grains. Famous geological formations like the Grand Canyon or the Red Rocks of Sedona are primarily made of this material.

Field identification & locations

Identify by its gritty, sandpaper-like texture and visible sand grains. It is commonly found in riverbeds, canyons, and sedimentary basins. Check for porousness by placing a drop of water on it; it should absorb slightly.