sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
AI-generated identification · may be incorrectMohs hardness 6-7, typically tan, brown, or reddish, dull luster, clastic texture with visible sand grains, specific gravity 2.2-2.8.
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Physical properties
Mohs hardness 6-7, typically tan, brown, or reddish, dull luster, clastic texture with visible sand grains, specific gravity 2.2-2.8.
Formation & geological history
Formed from the accumulation, compaction, and cementation of mineral particles or rock fragments, predominantly quartz, over millions of years in desert, river, or marine environments.
Uses & applications
Widely used in construction as a building stone, paving material, and in the manufacture of glass and concrete.
Geological facts
Sandstone formations often preserve ancient ripple marks and fossilized tracks, providing vital clues about prehistoric environments.
Field identification & locations
Identified by its gritty texture and visible sand grains; commonly found worldwide in sedimentary basins and arid regions.
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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
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Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
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Sandstone
Arenite
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Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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