sedimentary

Sandstone (Red Sandstone)

Arenite

Hardness: 6-7 Mohs; Color: reddish-brown due to iron oxide; Luster: dull/earthy; Crystal structure: clastic/granular texture with visible sand grains; 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 texture with visible sand grains; Cleavage: none; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral particles or rock fragments in environments such as deserts, riverbeds, or beaches. The red color suggests deposition in an oxygen-rich terrestrial environment.

Uses & applications

Commonly used as a building material, in flagstone for landscaping, and as an industrial abrasive. Fine-grained varieties are used for grindstones.

Geological facts

Red sandstone is famous for creating the iconic landscapes of the American Southwest, such as the Grand Canyon and Zion National Park. It often contains primary sedimentary structures like cross-bedding.

Field identification & locations

Identify in the field by its gritty, sandpaper-like feel and visible grains. Found worldwide in sedimentary basins. Collectors often look for unique shapes (like heart shapes) or desert rose formations.