sedimentary
Limestone
Calcareous sedimentary rock (CaCO3)
AI-generated identification · may be incorrectHardness 3 on Mohs scale, typically white, gray, or tan in color, with a dull to earthy luster and fine-grained crystal structure.
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Physical properties
Hardness 3 on Mohs scale, typically white, gray, or tan in color, with a dull to earthy luster and fine-grained crystal 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 building stone, aggregate in concrete, and in the manufacturing of cement, lime, and agriculture soil conditioners.
Geological facts
Limestone often contains well-preserved fossils of ancient marine organisms and can form dramatic karst landscapes featuring caves and sinkholes.
Field identification & locations
Easily identified by its characteristic fizz when exposed to dilute hydrochloric acid due to the presence of calcium carbonate.
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Other sedimentary specimens
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)
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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