sedimentary
Sandstone
Clastic Sedimentary Rock
AI-generated identification · may be incorrectHardness of 6-7 on Mohs scale depending on cement, typically tan, brown, or reddish, dull to earthy luster, quartz-rich composition, and granular texture.
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Physical properties
Hardness of 6-7 on Mohs scale depending on cement, typically tan, brown, or reddish, dull to earthy luster, quartz-rich composition, and granular texture.
Formation & geological history
Formed from the accumulation, compaction, and cementation of mineral particles or rock fragments, predominantly quartz, over millions of years.
Uses & applications
Widely used in construction as building stone, dimension stone, and for paving or landscaping.
Geological facts
Sandstone formations often preserve ancient desert dunes or riverbeds, providing key clues about Earth's paleoclimate.
Field identification & locations
Identified by its gritty texture and visible sand grains; commonly found in deserts, river valleys, and mountainous sedimentary layers.
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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
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Shale
Fissile Sedimentary Rock
sedimentary
Sandstone
Arenite
sedimentary
Shale
Clastic sedimentary rock
sedimentary