sedimentary
Limestone
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectMohs hardness 3, typically light gray to white or buff colored, dull to earthy luster, microcrystalline to granular structure.
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Physical properties
Mohs hardness 3, typically light gray to white or buff colored, dull to earthy luster, microcrystalline to granular structure.
Formation & geological history
Formed through the accumulation of skeletal fragments of marine organisms or chemical precipitation in shallow marine environments.
Uses & applications
Widely used in construction as building stone, aggregate in concrete, and in the manufacture of lime and cement.
Geological facts
Limestone frequently contains well-preserved fossils and forms dramatic karst landscapes featuring caves and sinkholes.
Field identification & locations
Easily identified by its characteristic fizz when tested with dilute hydrochloric acid due to the release of carbon dioxide.
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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