sedimentary

Sandstone (Red)

Arenite (composed primarily of SiO2)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs); Color: Reddish-brown due to iron oxide; Luster: Dull/Earthy; Crystal structure: Clastic (granular); Cleavage: None; Specific gravity: 2.2-2.8

Hardness: 6-7 (Mohs)
Color: Reddish-brown due to iron oxide
Luster: Dull/Earthy

Identified June 8, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs); Color: Reddish-brown due to iron oxide; Luster: Dull/Earthy; Crystal structure: Clastic (granular); Cleavage: None; Specific gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments, often in desert or river environments. The red color suggests deposition in an oxygen-rich environment where iron minerals oxidized.

Uses & applications

Commonly used as a building material, in decorative masonry, landscaping, and as a reservoir rock in the petroleum industry.

Geological facts

Red sandstone is what gives famous landscapes like the Grand Canyon and Sedona, Arizona, their distinctive color. It often preserves ripple marks and cross-bedding from ancient dunes.

Field identification & locations

Identify by its gritty, sandpaper-like texture and visible grains. It is extremely common in sedimentary basins worldwide. For collectors, look for unique weathering patterns or fossils.