sedimentary
Limestone
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness of 3 on the Mohs scale, colors range from white to gray and tan, earthy to dull luster, and effervesces strongly in dilute hydrochloric acid.
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Physical properties
Hardness of 3 on the Mohs scale, colors range from white to gray and tan, earthy to dull luster, and effervesces strongly in dilute hydrochloric acid.
Formation & geological history
Formed through the accumulation of organic debris like shells and coral or chemical precipitation in shallow marine environments over millions of years.
Uses & applications
Widely used in the manufacture of cement, construction aggregate, agricultural soil treatment, and the production of lime.
Geological facts
Limestone frequently contains well-preserved fossils and forms dramatic landscapes like caves and sinkholes via chemical weathering.
Field identification & locations
Identified by its softness, reaction to acid, and frequent fossil content; found extensively worldwide in sedimentary basins.
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Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion
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Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
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Sandstone or Siltstone
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Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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