sedimentary

Banded Sandstone

Quartz Arenite (with iron oxide banding)

AI-generated identification · may be incorrect

Mohs hardness 6 to 7; grainy, sandpaper-like texture; light tan to grey with brown/rust-colored iron oxide liesegang banding; dull to earthy luster; framework dominated by rounded to subangular quartz grains.

Identified July 24, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed by the compaction and cementation of mineral particles or rock fragments, typically in ancient desert sand dunes, beaches, or riverbeds. The reddish-brown bands result from iron-rich groundwater precipitating iron oxide in the pore spaces.

Uses & applications

Widely used as building stone, flagstone, paving material, and decorative landscaping rock. Clean quartz sandstones are also crushed for manufacturing glass.

Geological facts

The striking parallel lines seen on this specimen are known as bedding planes or iron staining (Liesegang rings), which record changes in sediment deposition or fluid flow through time.

Field identification & locations

Identified by its gritty, abrasive feel like sandpaper and visible sand grains cemented together. Commonly found worldwide in sedimentary basins, canyon walls, and river valleys.