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 an amorphous or fine-grained crystalline structure.
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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 an amorphous or fine-grained crystalline structure.
Formation & geological history
Formed through the accumulation of shell, coral, algal, and fecal debris, or by chemical precipitation of calcium carbonate from water in marine environments.
Uses & applications
Widely used in construction as aggregate for road bases, as a primary component in manufacturing Portland cement, and in agriculture for soil conditioning.
Geological facts
Limestone often contains well-preserved fossils of ancient marine organisms and can form massive cave systems through dissolution by acidic groundwater.
Field identification & locations
Easily identifiable in the field by its characteristic effervescence when exposed to dilute hydrochloric acid. It is globally abundant in sedimentary basins.
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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)
Sedimentary
Sandstone
Arenite
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Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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