sedimentary
Sandstone (with Liesegang rings)
Quartz Sandstone (SiO2 with Fe-oxide staining)
Hardness: 6-7 on Mohs scale; Color: yellowish-brown, tan, and reddish-orange due to iron oxides; Luster: dull to earthy; Texture: medium-grained, gritty feel; Features prominent concentric Liesegang banding caused by chemical precipitation.
- Hardness
- 6-7 on Mohs scale
- Color
- yellowish-brown, tan, and reddish-orange due to iron oxides
- Luster
- dull to earthy
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Physical properties
Hardness: 6-7 on Mohs scale; Color: yellowish-brown, tan, and reddish-orange due to iron oxides; Luster: dull to earthy; Texture: medium-grained, gritty feel; Features prominent concentric Liesegang banding caused by chemical precipitation.
Formation & geological history
Formed by the deposition and cementation of sand-sized mineral particles (mostly quartz) in river, beach, or desert environments. The swirling liesegang rings formed post-deposition when iron-bearing groundwater percolated through the porous rock, precipitation iron hydroxide/oxide bands.
Uses & applications
Commonly used as dimension stone, flagstone for landscaping, retaining walls, decorative garden accents, and architectural building stone.
Geological facts
The swirling patterns visible on the surface are called Liesegang rings or Liesegang bands, named after the German chemist Raphael E. Liesegang who discovered the secondary precipitation phenomenon in 1896.
Field identification & locations
Easily identified by its gritty sand-like surface texture and distinct swirling, tree-ring-like concentric iron stain bands. Commonly found in sedimentary basins throughout North America and worldwide. Decorative field stones of this size are valued around $10-$30.
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