sedimentary

Sandstone with Iron Banding

Arenite with Hematite or Limonite staining (SiO2 with Fe2O3)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs); Color: Tan to grey with reddish-brown bands; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None

Hardness: 6-7 (Mohs)
Color: Tan to grey with reddish-brown bands
Luster: Dull/Earthy

Identified June 5, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs); Color: Tan to grey with reddish-brown bands; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None

Formation & geological history

Formed by the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in riverbeds or deserts. Banding is caused by iron-rich groundwater precipitating minerals into the porous rock.

Uses & applications

Commonly used as building stone, decorative masonry, and in glass manufacturing depending on purity. Small banded pieces are often kept as curiosities or paperweights.

Geological facts

The banding seen here, often called Liesegang rings, develops as a result of rhythmic precipitation within fluid-saturated rocks. Many formations in the Southwestern US are famous for these color patterns.

Field identification & locations

Identify by its gritty texture (feels like sandpaper) and visible layering. It is found globally in sedimentary basins. The lower stone appears to be a water-worn river cobble of basalt or siltstone.