sedimentary
Limestone
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness 3 on Mohs scale, color ranges from white and gray to tan or brown, luster is earthy to dull, and it exhibits a massive or granular crystal structure.
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Physical properties
Hardness 3 on Mohs scale, color ranges from white and gray to tan or brown, luster is earthy to dull, and it exhibits a massive or granular 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, aggregate in concrete, production of lime and cement, and in agricultural soil treatment.
Geological facts
Limestone frequently contains well-preserved fossils and dissolves slowly in acidic water, creating striking underground cave systems and karst topography.
Field identification & locations
Easily 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