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, fine-grained 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, fine-grained crystal structure.
Formation & geological history
Formed through the accumulation of organic remains like shells and coral or chemical precipitation in shallow marine environments over millions of years.
Uses & applications
Widely used in construction for road base, production of cement, agriculture to neutralize soil acidity, and in the manufacture of glass.
Geological facts
Limestone often contains well-preserved fossils and forms dramatic landscapes such as caves and karst topography through chemical dissolution.
Field identification & locations
Identified by its characteristic effervescence when exposed to dilute hydrochloric acid; found globally in sedimentary basins.
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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