sedimentary
Banded Sandstone (Liesegang Rings)
Sedimentary Arenite (SiO2 with FeO/Fe2O3 impurities)
Hardness: 6-7 (Mohs scale); Color: Cream, tan, and brown with rhythmic orange/red banding; Luster: Dull/Earthy; Crystal structure: Granular (clastic texture); Cleavage: None; Specific gravity: 2.2-2.8.
- Hardness
- 6-7 (Mohs scale)
- Color
- Cream, tan, and brown with rhythmic orange/red banding
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Cream, tan, and brown with rhythmic orange/red banding; Luster: Dull/Earthy; Crystal structure: Granular (clastic texture); Cleavage: None; Specific gravity: 2.2-2.8.
Formation & geological history
Formed through the lithification of sand grains (mostly quartz). The visible banding (Liesegang rings) is a secondary chemical process occurring after deposition, where mineral-rich groundwater (iron oxide) precipitates in rhythmic patterns within the porous rock.
Uses & applications
Commonly used as a decorative building stone (veneers, paving, fireplace hearths). Fine specimens are used in lapidary for 'picture sandstone' cabochons or as landscape garden features.
Geological facts
The banding patterns often resemble wood grain, waves, or desert landscapes. While the rock itself may be hundreds of millions of years old, the iron staining (the bands) can be much younger, sometimes forming long after the rock was solidified.
Field identification & locations
Identify in the field by its gritty 'sandpaper' feel and distinctive wavy, concentric, or parallel iron-oxide bands. It is frequently found in arid regions like the American Southwest (Utah/Arizona/Colorado) and in riverbeds where erosion has rounded the stones.
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