sedimentary
Limestone
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness of 3 on the Mohs scale, typically white to gray or tan, dull to sub-earthy luster, and effervesces in dilute hydrochloric acid.
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Physical properties
Hardness of 3 on the Mohs scale, typically white to gray or tan, dull to sub-earthy luster, and effervesces in dilute hydrochloric acid.
Formation & geological history
Formed through the accumulation of skeletal fragments from marine organisms like coral, algal, and molluscan remains, often in shallow tropical marine waters.
Uses & applications
Widely used in construction as aggregate, in the production of cement, and as a soil conditioner in agriculture.
Geological facts
Limestone frequently contains well-preserved fossils and forms vast cave systems through chemical weathering by acidic groundwater.
Field identification & locations
Identified easily by its reaction with acid and relatively soft texture, 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
fossil
Sandstone or Siltstone
Arenite (if sandstone)
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Sandstone
Arenite
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Shale
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Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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