sedimentary
Limestone
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness 3 on Mohs scale, typically white, gray, or tan in color, with a dull to earthy luster and a fine-grained, massive crystal structure.
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Physical properties
Hardness 3 on Mohs scale, typically white, gray, or tan in color, with a dull to earthy luster and a fine-grained, massive crystal structure.
Formation & geological history
Formed through the accumulation of skeletal fragments from marine organisms like coral and foraminifera, or by chemical precipitation in shallow marine environments over millions of years.
Uses & applications
Widely used in construction as building stone, as an aggregate for road bases, in the manufacture of cement, and as a soil conditioner in agriculture.
Geological facts
Limestone frequently contains well-preserved fossils and forms dramatic karst landscapes featuring caves, sinkholes, and underground rivers.
Field identification & locations
Identified easily by its characteristic effervescence and fizzing reaction when exposed to dilute hydrochloric acid. It is 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