sedimentary
Limestone
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness 3 on Mohs scale, typically white to light gray or tan, dull to earthy luster, fine-grained crystal structure, good cleavage in three directions.
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Physical properties
Hardness 3 on Mohs scale, typically white to light gray or tan, dull to earthy luster, fine-grained crystal structure, good cleavage in three directions.
Formation & geological history
Formed from the accumulation of skeletal fragments from marine organisms like coral and mollusks in shallow marine environments over millions of years.
Uses & applications
Widely used in construction, cement production, agriculture for soil conditioning, and as a chemical feedstock.
Geological facts
Limestone often contains well-preserved fossils and forms dramatic karst landscapes featuring caves and sinkholes.
Field identification & locations
Identified easily by its fizzing reaction 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