sedimentary
Limestone
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness 3 on the Mohs scale. Colors range from white to gray and tan with a dull to earthy luster.
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Physical properties
Hardness 3 on the Mohs scale. Colors range from white to gray and tan with a dull to earthy luster.
Formation & geological history
Formed through the accumulation of skeletal fragments of marine organisms or chemical precipitation, typically in shallow marine environments.
Uses & applications
Extensively used in construction, cement production, agriculture, and as a chemical feedstock.
Geological facts
Limestone can dissolve in slightly acidic water, which creates extensive cave systems and karst topography.
Field identification & locations
Easily identified by its vigorous effervescence when exposed to dilute hydrochloric acid.
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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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