sedimentary
Sandstone (River Pebble)
Arenite (primarily SiO2)
AI-generated identification · may be incorrectHardness 6-7 on Mohs scale; dull/earthy luster; granular sandy texture; brownish-tan color; no cleavage.
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Physical properties
Hardness 6-7 on Mohs scale; dull/earthy luster; granular sandy texture; brownish-tan color; no cleavage.
Formation & geological history
Formed by the compaction and cementation of mineral particles or rock fragments, followed by fluvial erosion and tumbling into a smooth cobble.
Uses & applications
Used widely in construction aggregates, landscaping, and building stones; smooth river stones are common decorative elements.
Geological facts
Sandstone makes up about 20-25% of all sedimentary rocks on Earth. Its natural porosity allows it to act as an important reservoir for groundwater and petroleum.
Field identification & locations
Identified by its gritty, sandpaper-like surface texture and visible quartz grains; abundant along riverbeds, beaches, and alluvial deposits.
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Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion
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Sandstone or Siltstone
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Sedimentary
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
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Shale
Fissile Sedimentary Rock
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Sandstone
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Shale
Clastic sedimentary rock
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