sedimentary
Sandstone with Liesegang Rings
Arenite with Iron Oxide Liesegang Banding
Hardness: 6-7 (Mohs scale), Color: tan to reddish-brown, Luster: dull/earthy, Crystal Structure: clastic (granular), Cleavage: none, Specific Gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs scale), Color: tan to reddish-brown, Luster: dull/earthy, Crystal Structure: clastic (granular), Cleavage: none, Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the cementation of sand-sized grains. The distinctive 'rings' or bands are Liesegang rings, which form when fluid saturated with minerals (typically iron oxides) precipitates in rhythmic patterns within a porous rock over long geological periods.
Uses & applications
Used primarily as decorative landscaping stone, building material (flagstone), and as unique educational or display specimens for geological collectors.
Geological facts
Liesegang rings are named after the chemist Raphael E. Liesegang, who first observed the phenomenon. While common in sandstone, they can also form in chert and even some igneous rocks.
Field identification & locations
Identify in the field by the visible sand-sized grains and characteristic 'bullseye' or striped rhythmic bands of color. Common in arid desert environments and plateaus like the Colorado Plateau.
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