sedimentary
Banded Sandstone
Arenite with Liesegang banding (primarily SiO2 with FeO(OH) impurities)
Hardness: 6-7 on Mohs scale; Color: Tan, beige, and reddish-brown bands; Luster: Dull to earthy; Crystal structure: Granular (clastic); Cleavage: None; Specific gravity: 2.2-2.8.
- Hardness
- 6-7 on Mohs scale
- Color
- Tan, beige, and reddish-brown bands
- Luster
- Dull to earthy
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Tan, beige, and reddish-brown bands; Luster: Dull to earthy; Crystal structure: Granular (clastic); Cleavage: None; Specific gravity: 2.2-2.8.
Formation & geological history
Formed through the accumulation and cementation of mineral particles or rock fragments. The distinct stripes (Liesegang rings) are caused by the rhythmic precipitation of iron oxides within the porous rock over millions of years through groundwater movement.
Uses & applications
Used primarily in landscaping, decorative stone masonry, and construction. In polished forms, it is used for coasters, bookends, or as paperweights for hobbyists.
Geological facts
The banding often mimics the look of wood grain or desert landscapes. These specimens are frequently found in arid environments where groundwater chemistry has fluctuated significantly over geological time.
Field identification & locations
Identify by its gritty, sandpaper-like texture and visible layers of different colors. It is commonly found in riverbeds, canyons, and sedimentary basins. It will not fizz with acid unless the cement is calcitic.
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