sedimentary
Sandstone (Wonderstone)
Arenite (composed primarily of SiO2 with Fe2O3 impurities)
Hardness: 6-7 (depending on cementation); Color: Tan, brown, and reddish-pink banding; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8.
- Hardness
- 6-7 (depending on cementation)
- Color
- Tan, brown, and reddish-pink banding
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (depending on cementation); Color: Tan, brown, and reddish-pink banding; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8.
Formation & geological history
Formed from the lithification of sand-sized mineral particles or rock fragments. The distinct rhythmic banding (Liesegang rings) is caused by the precipitation of iron oxides from groundwater moving through the porous rock over millions of years.
Uses & applications
Used primarily as decorative landscaping stones, paperweights, or lapidary material for cabochons. Massive sandstone is used in construction and paving.
Geological facts
The swirls and bands are known as Liesegang rings, named after the chemist Raphael E. Liesegang. These patterns often mimic landscapes, which is why some varieties are called 'Picture Sandstone'.
Field identification & locations
Identified by its gritty 'sandpaper' texture and visible layering. It is commonly found in arid regions like the American Southwest (Utah, Arizona). Collectors look for high-contrast banding and 'scenic' patterns.
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