sedimentary

Red Sandstone

Ferruginous Sandstone

Hardness: 6-7 on Mohs scale; Color: Deep reddish-brown to orange-red; Luster: Dull to earthy; Structure: Clastic, fine to medium-grained; Cleavage: None; Specific Gravity: 2.2 to 2.8

Hardness: 6-7 on Mohs scale
Color: Deep reddish-brown to orange-red
Luster: Dull to earthy

Identified June 28, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale; Color: Deep reddish-brown to orange-red; Luster: Dull to earthy; Structure: Clastic, fine to medium-grained; Cleavage: None; Specific Gravity: 2.2 to 2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in arid or river environments. The red color indicates the oxidation of iron minerals (hematite) during or after deposition, common in layers dating from the Permian and Triassic periods.

Uses & applications

Used widely as a building material, decorative stone in landscaping, for making grindstones, and sometimes as an abrasive.

Geological facts

The vibrant red color is caused by a thin coating of hematite (iron oxide) on the sand grains. Famous formations include the Grand Canyon walls and the Red Rocks in Colorado.

Field identification & locations

Identify by its gritty, sandpaper-like texture and its tendency to rub off a bit of red dust if scratched. Found in sedimentary basins globally, such as the American Southwest and the United Kingdom.