sedimentary
Banded Sandstone / Quartzite Pebble
Sedimentary quartz arenite with liesegang banding
Hardness of 6-7 on the Mohs scale, varying tan, brown, and dark grey/black stripes, vitreous to dull luster, dense crystalline quartz structure, smooth water-worn surface.
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Physical properties
Hardness of 6-7 on the Mohs scale, varying tan, brown, and dark grey/black stripes, vitreous to dull luster, dense crystalline quartz structure, smooth water-worn surface.
Formation & geological history
Formed from ancient quartz sand deposits cemented together over millions of years, often featuring secondary iron oxide (Liesegang) staining patterns developed through groundwater percolation.
Uses & applications
Used primarily as a decorative landscaping stone, in rock tumbling, or as a collectible beach/river pebble.
Geological facts
The distinct dark stripes are often caused by rhythmic precipitation of iron and manganese minerals, a natural chemical process known as Liesegang banding.
Field identification & locations
Commonly found in riverbeds and coastal beaches where durable quartz-rich rocks have undergone prolonged water tumbling and smoothing.
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