sedimentary
Sandstone (Banded)
Clastic sedimentary rock (primarily SiO2)
Hardness: 6-7 (Mohs scale), Color: tan, brown, grey, and cream bands, Luster: dull/earthy, Crystal structure: granular clastic, Cleavage: none, Specific gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs scale), Color: tan, brown, grey, and cream bands, Luster: dull/earthy, Crystal structure: granular clastic, Cleavage: none, Specific gravity: 2.2-2.8
Formation & geological history
Formed by the accumulation and cementation of mineral particles or rock fragments (sand) over millions of years, often in riverbeds, deserts, or marine environments. The banding represents different layers of deposition or mineral leaching.
Uses & applications
Used primarily as decorative stone, in construction as building material, and as a common specimen for educational geological collections.
Geological facts
The distinct bands in such stones are often caused by the presence of iron oxides or other minerals that seep through the porous sand layers. This specific specimen appears to be water-worn, resulting in a smooth 'river rock' texture.
Field identification & locations
Identify in the field by its gritty texture (feels like sandpaper) and visible bedding planes. Commonly found in basins or riverbanks where erosion has smoothed the rock surface.
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