sedimentary
Sandstone (Red Bed / Arenite)
Arenite (composed predominantly of SiO2 with iron oxides)
AI-generated identification · may be incorrectHardness 6-7 on Mohs scale; reddish-pink to brown color; dull, earthy luster; granular, clastic texture with sandpaper-like feel.
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Physical properties
Hardness 6-7 on Mohs scale; reddish-pink to brown color; dull, earthy luster; granular, clastic texture with sandpaper-like feel.
Formation & geological history
Formed by the compaction and cementation of mineral- or rock-derived sand grains in ancient deserts, rivers, or beach environments, colored red by iron oxide cement.
Uses & applications
Extensively used as a building stone, paving flagstone, architectural facing, and crushed aggregate.
Geological facts
Red sandstone formations comprise iconic global landmarks, including the American Southwest's canyonlands and Petra in Jordan.
Field identification & locations
Identified by visible sand-sized grains, gritty texture, and scratch-resistance consistent with quartz. Abundant globally in sedimentary basins.
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Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite
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Shale
Shale (clastic sedimentary rock)
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Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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