sedimentary
Limestone
Calcium carbonate, CaCO3
AI-generated identification · may be incorrectHardness of 3 on the Mohs scale, typically white to gray or buff 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 white to gray or buff 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 of calcium carbonate in shallow marine environments over millions of years.
Uses & applications
Widely used in construction as building stone, as aggregate for roads, in the production of cement, and in agricultural soil conditioning.
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 treated with dilute hydrochloric acid due to the release of carbon dioxide gas.
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Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
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Sandstone or Siltstone
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