sedimentary
Limestone
Calcium carbonate (CaCO3)
AI-generated identification · may be incorrectHardness of 3 on the Mohs scale, typically white, gray, or buff in color, with a dull to earthy luster and fine-grained texture.
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Physical properties
Hardness of 3 on the Mohs scale, typically white, gray, or buff in color, with a dull to earthy luster and fine-grained texture.
Formation & geological history
Formed through the accumulation of skeletal fragments from marine organisms like coral and molluscs in shallow marine environments over millions of years.
Uses & applications
Extensively used in construction as building material, crushed stone for road base, and as a primary raw material for manufacturing cement and agricultural lime.
Geological facts
Limestone frequently contains well-preserved fossils and dissolves slowly in acidic water, creating extensive cave systems and karst topography.
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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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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