sedimentary
Wonderstone (Liesegang Sandstone)
Silicified Sandstone with Liesegang Rings (SiO2 + FeO(OH))
Hardness: 6.5-7 Mohs; Color: Tan, reddish-brown, and golden yellow bands; Luster: Dull to earthy; Crystal structure: Microcrystalline/non-crystalline matrix; Cleavage: None; Specific gravity: 2.6-2.7
- Hardness
- 6
- Color
- Tan, reddish-brown, and golden yellow bands
- Luster
- Dull to earthy
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Physical properties
Hardness: 6.5-7 Mohs; Color: Tan, reddish-brown, and golden yellow bands; Luster: Dull to earthy; Crystal structure: Microcrystalline/non-crystalline matrix; Cleavage: None; Specific gravity: 2.6-2.7
Formation & geological history
Formed through the rhythmic precipitation of iron oxide (hematite or limonite) within porous sandstone or volcanic tuff. This often occurs during chemical weathering as groundwater saturated with minerals seeps through the rock. Geological age varies but is commonly associated with Eocene to Miocene volcanic environments in the Western US.
Uses & applications
Primarily used for decorative purposes, lapidary arts (cabochons and carvings), interior landscaping, and as a popular specimen for rock hounds due to its aesthetic banding.
Geological facts
The characteristic 'rings' are scientifically known as Liesegang bands. These patterns represent a chemical reaction that happened millions of years ago, creating a visual capture of fluid movement through solid rock. It is often mistaken for petrified wood because of its 'grain-like' appearance.
Field identification & locations
Identify in the field by its distinct concentric or rhythmic banding that resembles wood grain and its smooth, water-worn texture if found in washes. Common in the Kanab area of Utah and parts of Nevada and Arizona. It will not react with acid, distinguishing it from limestone.
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