sedimentary
Banded Sandstone
Arenite (Sandstone with iron oxide banding)
Hardness: 6-7 (Mohs scale); Color: Tan, brown, and orange; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Contains visible quartz grains.
- Hardness
- 6-7 (Mohs scale)
- Color
- Tan, brown, and orange
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Tan, brown, and orange; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Contains visible quartz grains.
Formation & geological history
Formed from the accumulation and cementation of sand-sized mineral particles or rock fragments. The distinct banding is caused by rhythmic precipitation of iron oxides (like limonite or hematite) through groundwater movement.
Uses & applications
Used primarily as decorative stone, building material, and in landscaping. Smaller water-worn specimens are popular for rock tumbling and as pocket stones.
Geological facts
The rhythmic bands seen in such rocks are often referred to as Liesegang rings, which are secondary structures formed by chemical precipitation rather than original sedimentary layering.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and distinct parallel or concentric color layers. Commonly found in desert regions, riverbeds, and coastal cliffs.
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