sedimentary
Limestone
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness 3 on the Mohs scale, typically gray or tan in color, with a dull to earthy luster and fine-grained texture.
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Physical properties
Hardness 3 on the Mohs scale, typically gray or tan in color, with a dull to earthy luster and fine-grained texture.
Formation & geological history
Formed through the accumulation of skeletal fragments, coral, algal, and fecal debris in shallow marine environments over millions of years.
Uses & applications
Widely used in construction as aggregate, in the production of cement, for agricultural soil conditioning, and in industrial chemical processes.
Geological facts
Limestone frequently contains well-preserved fossils of ancient marine organisms and dissolves slowly in acidic water to form spectacular cave systems.
Field identification & locations
Identified by its characteristic fizz when exposed to dilute hydrochloric acid; found globally in sedimentary basins and ancient sea beds.
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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