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 vitreous luster, and effervesces strongly in weak 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 vitreous luster, and effervesces strongly in weak hydrochloric acid.
Formation & geological history
Formed through the accumulation of organic debris like shell and coral fragments or chemical precipitation in shallow marine environments over millions of years.
Uses & applications
Widely used in construction as building stone, aggregate in concrete, and as a primary raw material for manufacturing cement and agricultural lime.
Geological facts
Limestone is famous for hosting extensive cave systems and underground drainage networks formed by the dissolution of calcium carbonate by slightly acidic groundwater.
Field identification & locations
Easily identifiable in the field by its characteristic reaction with acid and fossiliferous inclusions, commonly found in sedimentary basins worldwide.
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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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