sedimentary
Sandstone (Banded)
Arenite with Iron Oxide Banding
Hardness: 6-7 Mohs; Color: Tan to yellow with dark reddish-brown bands; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None
- Hardness
- 6-7 Mohs
- Color
- Tan to yellow with dark reddish-brown bands
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Tan to yellow with dark reddish-brown bands; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. The dark bands are caused by rhythmic precipitation of iron oxide (Liesegang rings) by groundwater.
Uses & applications
Primarily used in construction, decorative landscaping, and as an architectural stone. Smooth pebbles are also popular for rock painting and educational kits.
Geological facts
The rhythmic banding patterns (Liesegang rings) occur when minerals precipitate in fluid-saturated rocks, creating colorful stripes that look like tree rings or landscapes.
Field identification & locations
Look for a gritty, sandpaper-like texture and visible sedimentary layering. It is common in riverbeds, deserts, and coastal areas throughout the American Southwest and Midwestern US.
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