sedimentary
Limestone
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectMohs hardness of 3, colors range from white to gray and tan, dull to earthy luster, and it readily effervesces in dilute hydrochloric acid.
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Physical properties
Mohs hardness of 3, colors range from white to gray and tan, dull to earthy luster, and it readily effervesces in dilute hydrochloric acid.
Formation & geological history
Formed mainly through the accumulation of organic remains like shells and coral, or chemical precipitation in shallow marine environments over millions of years.
Uses & applications
Extensively used in construction as aggregate, for producing cement, in agriculture to neutralize soil acidity, and as a dimension stone.
Geological facts
Limestone often preserves abundant fossils and forms spectacular cave systems through dissolution by acidic groundwater.
Field identification & locations
Identify in the field by its characteristic soft texture and strong fizzing reaction with acid; found worldwide in sedimentary basins.
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Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
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Sandstone or Siltstone
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Shale
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