sedimentary
Sandstone with Iron Banding
Arenite with Hematite or Limonite staining (SiO2 with Fe2O3)
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
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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.
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