sedimentary
Banded Sandstone
Arenite (with iron oxide banding)
Hardness: 6-7 (Mohs scale), Color: Cream, tan, and reddish-brown, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Specific Gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Cream, tan, and reddish-brown, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Specific Gravity: 2.2-2.8
Formation & geological history
Formed via the accumulation and cementation of mineral particles or rock fragments. The distinct banding (Liesegang rings) is caused by the precipitation of minerals, typically iron oxides, from groundwater moving through porous rock over geological time.
Uses & applications
Used in construction for cladding, paving, and decorative garden features. High-quality banded specimens are used for lapidary work such as coasters, paperweights, and cabochons.
Geological facts
The rhythmic banding patterns are often mistaken for tree rings or fossils, but they are chemical precipitation phenomena. Famous locations include the 'Wonderstone' deposits in Utah, USA.
Field identification & locations
Identify by the gritty texture (like sandpaper) and visible layers or rings. Found globally in ancient riverbeds, deserts, and coastal areas. Collectors value specimens with high contrast and geometric patterns.
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