sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
AI-generated identification · may be incorrectHardness 6-7 on Mohs scale, colors range from tan and brown to red and yellow, dull earthy luster, granular clastic texture.
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Physical properties
Hardness 6-7 on Mohs scale, colors range from tan and brown to red and yellow, dull earthy luster, granular clastic texture.
Formation & geological history
Formed by the accumulation, compaction, and cementation of mineral particles or rock fragments, predominantly quartz, over millions of years.
Uses & applications
Widely used in construction for building stone, paving, and decorative aggregate, as well as an aquifer reservoir rock.
Geological facts
Sandstone can preserve ancient environments through ripples and fossil tracks; famous monuments like Petra are carved directly into it.
Field identification & locations
Identify by visible sand-sized grains and gritty texture; commonly found in deserts, riverbeds, and sedimentary basins worldwide.
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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)
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Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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