sedimentary

Red Sandstone

Arenite (SiO2 with Fe2O3)

Hardness: 6-7 (Mohs scale); Color: Reddish-brown to tan; Luster: Dull, earthy; Crystal structure: Clastic (composed of grains); Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 (Mohs scale)
Color: Reddish-brown to tan
Luster: Dull, earthy

Identified July 15, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale); Color: Reddish-brown to tan; Luster: Dull, earthy; Crystal structure: Clastic (composed of grains); Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed by the accumulation and lithification of sand-sized mineral grains or rock fragments. The red color is typically due to iron oxide minerals (hematite) coating the grains. Often found in ancient desert, river, or ocean environments.

Uses & applications

Used extensively in building construction (paving, walls, monuments), landscaping, and as a material for glass making if silica content is high.

Geological facts

Red sandstone is famous for creating the landscape of the American Southwest, including the Grand Canyon. It has been used as a primary building material since prehistoric times.

Field identification & locations

Identified by its gritty sandpaper feel and visible sand grains. Commonly found in sedimentary basins and arid regions globally. Its durability makes it a favorite for architectural masonry.