sedimentary
Sandstone
Arenite (primarily SiO2)
AI-generated identification · may be incorrectHardness 6-7 on the Mohs scale, earthy luster, gritty sandpaper-like texture, light tan to buff color with visible sand grains.
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Physical properties
Hardness 6-7 on the Mohs scale, earthy luster, gritty sandpaper-like texture, light tan to buff color with visible sand grains.
Formation & geological history
Formed by the compaction and cementation of mineral particles or rock fragments (often quartz) in desert, river, or marine environments over millions of years.
Uses & applications
Extensively used as a building and architectural material, paving stone, and in the manufacturing of glass and concrete.
Geological facts
Sandstone can preserve fossilized footprints, ripples from ancient water currents, and acts as major aquifers and petroleum reservoirs worldwide.
Field identification & locations
Identify by its abrasive, gritty feel when rubbed and faint bedding planes; common in sedimentary basins, canyons, and riverbeds globally.
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Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion
Calcareous concretion; exact fossil and host-rock composition are not identifiable from the image
fossil
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary