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 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 vitreous luster, and effervesces strongly in dilute hydrochloric acid.
Formation & geological history
Formed through the accumulation of skeletal fragments from marine organisms or chemical precipitation in shallow marine environments over millions of years.
Uses & applications
Extensively used in construction, production of cement and lime, agriculture, and as a dimension stone.
Geological facts
Limestone frequently contains well-preserved fossils and forms dramatic karst landscapes featuring caves, sinkholes, and underground rivers.
Field identification & locations
Easily identified by its reaction to acid and its typically fine-grained, light-colored appearance; found globally in sedimentary basins.
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