sedimentary

Red Sandstone

Sandstone (Quartz Arenite with Iron Oxide)

AI-generated identification · may be incorrect

Hardness: 6-7 (individual grains); Color: Reddish-brown to tan; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 (individual grains)
Color: Reddish-brown to tan
Luster: Dull/Earthy

Identified July 19, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (individual grains); Color: Reddish-brown to tan; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized grains of mineral or rock fragments. The red color is caused by the oxidation of iron minerals (hematite). Commonly formed in arid desert environments or river deltas.

Uses & applications

Construction material, decorative landscaping, historical building stone, and occasionally used in abrasive manufacturing.

Geological facts

Red sandstone is responsible for the famous landscapes of the American Southwest, such as the Grand Canyon and Zion National Park. It often preserves ripple marks and cross-bedding from ancient winds and waters.

Field identification & locations

Identify by its gritty, sandpaper-like texture and its visible sand grains. Found globally in sedimentary basins. Collectors often look for pieces with interesting layering or fossils.