sedimentary

Red Sandstone

Arenite (Ferruginous Sandstone)

Hardness: 6-7 Mohs; Color: Reddish-orange to brown; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 Mohs
Color: Reddish-orange to brown
Luster: Dull/Earthy

Identified July 11, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Reddish-orange to brown; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Forming from the accumulation of sand-sized mineral particles or rock fragments. The red color indicates the presence of iron oxide (hematite) and suggests formation in an arid, terrestrial environment. This specimen appears water-worn or tumbled.

Uses & applications

Commonly used as a building material, decorative stone in landscaping, and in the manufacturing of glass or as a source of industrial sand.

Geological facts

The red color is caused by the oxidation of iron minerals, essentially 'rusting' the stone over millions of years. This provides the iconic look of places like the Grand Canyon.

Field identification & locations

Identified by its gritty sandpaper-like texture and reddish hue. Often found in riverbeds or coastal areas where it has been smoothed by water action.