sedimentary
Sandstone
Arenite (SiO2 dominant)
AI-generated identification · may be incorrectHardness: 6-7 (Mohs scale), Color: Brownish-tan to reddish-brown, Luster: Dull/Earthy, Crystal Structure: Clastic (sand-sized grains), Cleavage: None, Texture: Gritty/Sandpaper-like feel.
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Brownish-tan to reddish-brown, Luster: Dull/Earthy, Crystal Structure: Clastic (sand-sized grains), Cleavage: None, Texture: Gritty/Sandpaper-like feel.
Formation & geological history
Formed over millions of years by the accumulation and cementation of sand-sized mineral grains or rock fragments. These typically deposit in riverbeds, deserts, or coastal environments and undergo lithification through pressure and mineral precipitation.
Uses & applications
Commonly used as a building material, paving stones, and for ornamental masonry. In industry, it is a significant reservoir rock for oil, gas, and groundwater.
Geological facts
Sandstone can exhibit beautiful banding called Liesegang rings. It is the primary material forming the famous 'wave' and 'antelope canyon' structures in the American Southwest.
Field identification & locations
Identify in the field by its gritty texture (feels like sandpaper) and visible layering. It is found globally in sedimentary basins. Collectors often look for colorful banding or fossil inclusions.
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Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
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Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Generic Pebble / Rock Fragment
Lithic fragment / Weathered rock
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Sedimentary Sandstone
Arenite (Sedimentary Rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary