sedimentary
Limestone
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness of 3 on Mohs scale, colors range from white to gray and tan, dull to earthy luster, with a fine-grained to coarse crystal structure.
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Physical properties
Hardness of 3 on Mohs scale, colors range from white to gray and tan, dull to earthy luster, with a fine-grained to coarse 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
Extensively used in construction as building stone, as an aggregate for road base, in the production of cement, and in agriculture for soil neutralization.
Geological facts
Limestone formations often house extensive cave systems and well-preserved fossils due to the nature of their depositional environments.
Field identification & locations
Readily identified by its characteristic fizz when tested with dilute hydrochloric acid, and commonly found in sedimentary basins worldwide.
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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)
Sedimentary
Sandstone
Arenite
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary