sedimentary
Sandstone (Wonderstone)
Arenite with Liesegang rings
Hardness: 6-7 (Mohs), Color: Tan, brown, and reddish-orange, Luster: Dull to earthy, Structure: Clastic with concentric banding, Cleavage: None, Specific Gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs), Color: Tan, brown, and reddish-orange, Luster: Dull to earthy, Structure: Clastic with concentric banding, Cleavage: None, Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the cementation of sand-sized grains. The distinctive banding (Liesegang rings) is caused by the precipitation of iron oxides from groundwater flowing through porous rock over millions of years.
Uses & applications
Used for architectural cladding, decorative landscaping, garden ornaments, and as a popular specimen for rock collectors and lapidary art.
Geological facts
The rhythmic banding patterns resemble landscape paintings or wood grain. This specific variety is often called 'Wonderstone' and is highly sought after by artists for making bookends and sculptures.
Field identification & locations
Identify by visible sand grains and rhythmic, colored concentric or wavy bands. Commonly found in arid regions like Utah, Nevada, and Arizona in the United States.
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