sedimentary
Liesegang Banded Sandstone (Wonderstone)
Ferruginous Sandstone with Liesegang Rings
Hardness: 6-7 (Mohs scale); Color: Tan, brown, orange, and red; Luster: Dull to earthy; Crystal structure: Granular (clastic); Cleavage: None; Specific Gravity: 2.2 - 2.8
- Hardness
- 6-7 (Mohs scale)
- Color
- Tan, brown, orange, and red
- Luster
- Dull to earthy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Tan, brown, orange, and red; Luster: Dull to earthy; Crystal structure: Granular (clastic); Cleavage: None; Specific Gravity: 2.2 - 2.8
Formation & geological history
Formed through the chemical weathering of porous sandstone. Groundwater saturated with dissolved iron minerals (like hematite and goethite) permeates the rock, and rhythmic precipitation of these minerals creates the distinct nested bands or rings.
Uses & applications
Commonly used for ornamental stones, garden decor, lapidary projects (cabs and carvings), and as a popular specimen for educational geology collections.
Geological facts
The banding effect is named after the German chemist Raphael E. Liesegang, who first observed this rhythmic precipitation in gels. These 'rings' are often mistaken for tree rings or fossilized remains by amateur collectors.
Field identification & locations
Identify in the field by looking for distinct, repetitive color bands that cut across the original bedding planes of the sandstone. These are very common in the Southwestern United States, particularly in Utah and Arizona.
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