sedimentary
Sandstone fragment
Arenite (primarily Quartz, SiO2)
AI-generated identification · may be incorrectHardness 6-7 on Mohs scale; light tan to brownish color with a gritty, granular texture; dull/earthy luster.
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Physical properties
Hardness 6-7 on Mohs scale; light tan to brownish color with a gritty, granular texture; dull/earthy luster.
Formation & geological history
Formed through the compaction and cementation of mineral particles or rock fragments of sand size over millions of years in marine, river, or desert environments.
Uses & applications
Commonly used in construction, architectural building stone, flagstones, and paving.
Geological facts
Sandstone often preserves ripple marks, cross-bedding, and fossils from ancient sand dunes or beaches.
Field identification & locations
Identified in the field by its sandpapery feel and visible clastic grains; widely found worldwide in sedimentary basins.
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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