sedimentary
Sandstone
Arenite (primarily SiO2)
AI-generated identification · may be incorrectHardness 6–7 on Mohs scale; rough, gritty sand-like texture with dull/earthy luster; variable tan, yellow, or grey color.
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Physical properties
Hardness 6–7 on Mohs scale; rough, gritty sand-like texture with dull/earthy luster; variable tan, yellow, or grey color.
Formation & geological history
Formed through compaction and cementation of mineral particles and rock fragments (mostly quartz and feldspar) in desert, river, or beach environments.
Uses & applications
Widely used as building stone, paving, architectural facing, grindstones, and as an aggregate.
Geological facts
Sandstone formations act as major underground reservoirs for both groundwater and petroleum due to their high porosity and permeability.
Field identification & locations
Identified by its distinctly gritty sandpaper feel and visible quartz grains; widely distributed in sedimentary basins worldwide.
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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