sedimentary
Limestone
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness of 3 on the Mohs scale, typically tan, gray, or white in color, with a dull to earthy luster and fine-grained crystal structure.
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Physical properties
Hardness of 3 on the Mohs scale, typically tan, gray, or white in color, with a dull to earthy luster and fine-grained crystal structure.
Formation & geological history
Formed through the accumulation of skeletal fragments from marine organisms or chemical precipitation in shallow marine environments over millions of years.
Uses & applications
Widely used in the construction industry for concrete and road aggregate, as well as in agricultural soil conditioning and cement production.
Geological facts
Limestone frequently contains well-preserved fossils and dissolves slowly in acidic water, creating fascinating cave systems and karst topography.
Field identification & locations
Can be easily identified in the field by its characteristic reaction to dilute hydrochloric acid, which causes it to fizz and release carbon dioxide.
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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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