sedimentary
Limestone
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness of 3 on Mohs scale, typically white, gray, or tan in color, with a dull to earthy luster and a fine-grained crystalline or amorphous structure.
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Physical properties
Hardness of 3 on Mohs scale, typically white, gray, or tan in color, with a dull to earthy luster and a fine-grained crystalline or amorphous structure.
Formation & geological history
Formed through the accumulation and compaction of organic remains like shells and coral, or chemical precipitation in marine environments over millions of years.
Uses & applications
Widely used in construction as a primary component of cement and concrete, as crushed stone for road bases, and in agriculture to neutralize acidic soils.
Geological facts
Limestone frequently contains well-preserved fossils of ancient marine organisms and is easily dissolved by mildly acidic groundwater to form extensive cave systems.
Field identification & locations
Identified easily by its characteristic effervescence when exposed to dilute hydrochloric acid, and commonly found in sedimentary basins and ancient seabed regions worldwide.
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Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion
Calcareous concretion; exact fossil and host-rock composition are not identifiable from the image
fossil
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)
sedimentary