sedimentary

Banded Sandstone

Clastic Sedimentary Rock (Quartz Arenite)

AI-generated identification · may be incorrect

Hardness: 6-7 (on Mohs scale); Color: Variegated red, pink, and white bands; Luster: Dull/Earthy; Structure: Granular/Clastic with visible bedding planes; Cleavage: None

Hardness: 6-7 (on Mohs scale)
Color: Variegated red, pink, and white bands
Luster: Dull/Earthy

Identified July 15, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (on Mohs scale); Color: Variegated red, pink, and white bands; Luster: Dull/Earthy; Structure: Granular/Clastic with visible bedding planes; Cleavage: None

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. The distinct banding (lamination) represents different cycles of deposition or changes in mineral content (likely iron oxides for the red hues) over geological time, typically in desert or river environments.

Uses & applications

Primarily used as a decorative building stone, for flooring, paving, and wall cladding due to its aesthetic layering. Also popular among amateur geology collectors.

Geological facts

The red coloring is typically caused by the oxidation of iron minerals (hematite or goethite) within the sediment. Famous examples of this type of banded sandstone include the 'Wonderstone' found in Utah.

Field identification & locations

Identify in the field by its gritty texture (feels like sandpaper) and visible layering. It is commonly found in arid regions with significant exposed sedimentary layers, such as the Southwestern United States.