sedimentary
Limestone
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness 3 on the Mohs scale, typically gray or tan in color, dull to earthy luster, and reacts strongly with dilute hydrochloric acid.
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Physical properties
Hardness 3 on the Mohs scale, typically gray or tan in color, dull to earthy luster, and reacts strongly with 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
Widely used in construction as building stone, in the production of cement, and as a soil conditioner in agriculture.
Geological facts
Limestone frequently contains well-preserved fossils and forms dramatic cave systems through dissolution by acidic groundwater.
Field identification & locations
Identified by its moderate softness and effervescence with acid; commonly found in quarries and sedimentary rock layers 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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Shale
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Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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