sedimentary
Limestone
Sedimentary carbonate rock (CaCO3)
AI-generated identification · may be incorrectHardness 3 on Mohs scale, colors range from white to gray and tan, dull to earthy luster, cryptocrystalline or fine-grained structure with visible fossil fragments.
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Physical properties
Hardness 3 on Mohs scale, colors range from white to gray and tan, dull to earthy luster, cryptocrystalline or fine-grained structure with visible fossil fragments.
Formation & geological history
Formed through the accumulation of skeletal fragments, coral, algal, and fecal debris in shallow marine environments over millions of years.
Uses & applications
Extensively used in construction, production of cement, agriculture for soil conditioning, and as a dimensional building stone.
Geological facts
Limestone frequently dissolves in slightly acidic groundwater, creating extensive cave networks and dramatic karst topography worldwide.
Field identification & locations
Easily identified by its characteristic fizz when a drop of dilute hydrochloric acid is applied due to carbon dioxide release.
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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)
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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)
sedimentary