sedimentary
Limestone
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness of 3 on Mohs scale, typically white to gray or tan in color, dull to earthy luster, and reacts strongly with dilute hydrochloric acid.
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Physical properties
Hardness of 3 on Mohs scale, typically white to gray or tan in color, dull to earthy luster, and reacts strongly with dilute hydrochloric acid.
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 as building stone, in the production of cement, for agricultural soil conditioning, and in metallurgy.
Geological facts
Limestone frequently contains well-preserved fossils of ancient marine organisms. Famous structures like the Great Pyramid of Giza are built largely from limestone.
Field identification & locations
Identify in the field by its light color and characteristic fizzing reaction when exposed to acid. Found worldwide 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