sedimentary
Sandstone with Liesegang Rings
Arenite with Iron Oxide Concretions
Hardness: 6-7 (Mohs); Color: Tan, white, and reddish-brown; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs)
- Color
- Tan, white, and reddish-brown
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs); Color: Tan, white, and reddish-brown; Luster: Dull/Earthy; Structure: Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. The circular patterns (Liesegang rings) are secondary chemical precipitates formed by the rhythmic deposition of iron oxides from groundwater.
Uses & applications
Primarily used as a decorative garden stone, building material, or as a specimen for geological study and mineral collecting.
Geological facts
The rhythmic bands, called Liesegang rings, are named after the German chemist Raphael E. Liesegang. They were first observed in chemical precipitates in gels but are commonly found in sedimentary rocks.
Field identification & locations
Identify by its gritty texture and the distinctive concentric circular or wavy bands of color. Often found in arid environments or areas with significant groundwater movement through porous rock.
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