sedimentary

Sandstone (Wonderstone)

Arenite (composed primarily of SiO2 with Fe2O3 impurities)

AI-generated identification · may be incorrect

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

Identified March 6, 2026More sedimentary →

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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.