sedimentary
Banded Sandstone (Liesegang Rings)
Arenite with Liesegang rings (SiO2/Fe2O3)
Hardness: 6-7 (Mohs); Color: Off-white to light gray with orange-brown bands; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None; Specific Gravity: 2.3-2.6
- Hardness
- 6-7 (Mohs)
- Color
- Off-white to light gray with orange-brown bands
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs); Color: Off-white to light gray with orange-brown bands; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None; Specific Gravity: 2.3-2.6
Formation & geological history
Formed through the cementation of sand-sized grains. The distinctive 'stripes' are Liesegang rings, created by the chemical precipitation of iron oxides within the porous rock matrix through groundwater movement.
Uses & applications
Used primarily as decorative landscaping stone, in construction as building material, and for geological study or collecting.
Geological facts
The rhythmic banding is not caused by sedimentary layering but by a chemical reaction involving a supersaturated solution, similar to how colorful patterns form in some agates.
Field identification & locations
Identify by its sandy texture and periodic, concentric, or wavy iron-stained bands that cut across original bedding planes. Commonly found in arid or coastal regions where groundwater chemistry fluctuates.
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