sedimentary

Red Sandstone

Arenite (Ferruginous Sandstone)

Hardness: 6-7 (Mohs scale), Color: Reddish-brown to pink due to iron oxide, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Cleavage: None.

Identified June 9, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale), Color: Reddish-brown to pink due to iron oxide, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Cleavage: None.

Formation & geological history

Formed by the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in arid environments like deserts or riverbeds. The red color indicates the presence of hematite or iron oxide minerals during lithification.

Uses & applications

Used extensively in construction (as dimension stone for buildings), landscaping, paving, and occasionally for minor decorative items.

Geological facts

Red Sandstone is famous for creating the iconic landscapes of the American Southwest, such as the Grand Canyon and Sedona's Red Rocks. It often preserves fossils and ripple marks from ancient environments.

Field identification & locations

Identify by its sandpaper-like texture and visible sand grains. It is commonly found in sedimentary basins and arid regions globally. Collectors look for unique banding or fossil inclusions.