sedimentary
Sandstone
Arenite (composed predominantly of SiO2)
AI-generated identification · may be incorrectHardness 6-7 (individual quartz grains), gritty clastic texture, tan to yellowish-brown color, earthy to dull luster.
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Physical properties
Hardness 6-7 (individual quartz grains), gritty clastic texture, tan to yellowish-brown color, earthy to dull luster.
Formation & geological history
Formed through the compaction and cementation of sand-sized mineral grains, primarily quartz and feldspar, deposited in rivers, deserts, or marine environments.
Uses & applications
Commonly used in construction, architectural paving, and dimension stone.
Geological facts
Sandstone layers preserve sedimentary structures like cross-bedding and ripple marks that reveal ancient wind and water directions.
Field identification & locations
Identified by its visible sand grains and rough, gritty feel like sandpaper; found in sedimentary basins and arid plateaus globally.
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Other sedimentary specimens
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