sedimentary
Sandstone (or Siltstone / Ceramic Sherd)
Arenite / Siltstone (dominated by SiO2)
AI-generated identification · may be incorrectMohs hardness of roughly 6-7 (if quartz-rich) or 3-5 depending on matrix; reddish-brown to terracotta color, earthy/dull luster, fine clastic texture.
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Physical properties
Mohs hardness of roughly 6-7 (if quartz-rich) or 3-5 depending on matrix; reddish-brown to terracotta color, earthy/dull luster, fine clastic texture.
Formation & geological history
Formed by the accumulation, compaction, and cementation of mineral particles or rock fragments in terrestrial, fluvial, or shallow marine settings.
Uses & applications
Commonly utilized as building stone, flagstone, decorative aggregate, or abrasive material.
Geological facts
Iron oxides such as hematite give sedimentary rocks like this their distinctive rusty red or terracotta hue.
Field identification & locations
Identified by its gritty feel, uniform earthy color, and layered or granular breakage; extremely abundant globally in sedimentary basins.
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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