sedimentary
Banded Sandstone
Clastic Sandstone (SiO2 with iron oxides)
Hardness: 6-7 on Mohs scale (depending on silica cementation); Color: Tan, brown, and grey banding; Luster: Dull/Earthy; Texture: Granular, Clastic; Cleavage: None.
- Hardness
- 6-7 on Mohs scale (depending on silica cementation)
- Color
- Tan, brown, and grey banding
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 on Mohs scale (depending on silica cementation); Color: Tan, brown, and grey banding; Luster: Dull/Earthy; Texture: Granular, Clastic; Cleavage: None.
Formation & geological history
Formed through the deposition and lithification of sand-sized grains, typically in riverbeds or coastal environments. The banding represents distinct layers of sediment deposition or fluctuations in mineral content (like iron) during formation. Most sandstones are from the Paleozoic or Mesozoic eras.
Uses & applications
Primarily used in construction as building stone, pavers, or decorative landscaping. Large specimens are often used for sculpture or interior design accents.
Geological facts
The distinct bands in this specimen, often called Liesegang rings or sedimentary bedding, indicate changes in the environment or water flow during the rock's formation. This specific rounded shape suggests it was tumbled in a river or surf for a long period.
Field identification & locations
Look for a gritty, sandpaper-like texture and visible layers. It is ubiquitous in sedimentary basins worldwide. For collectors, aesthetically pleasing bands make it a popular garden or desk specimen.
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