sedimentary
Limestone
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness of 3 on the Mohs scale, typically white, gray, or tan in color, with a dull to earthy luster and a fine-grained crystal structure.
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Physical properties
Hardness of 3 on the Mohs scale, typically white, gray, or tan in color, with a dull to earthy luster and a fine-grained crystal structure.
Formation & geological history
Formed through the accumulation of skeletal fragments from marine organisms like coral and foraminifera, or chemical precipitation, primarily in shallow marine environments.
Uses & applications
Widely used in construction as building material and aggregate, in the production of cement, and as a soil conditioner in agriculture.
Geological facts
Limestone frequently contains well-preserved fossils and forms dramatic cave systems through dissolution by slightly acidic groundwater.
Field identification & locations
Easily identified in the field by its effervescence when exposed to dilute hydrochloric acid; found globally in sedimentary basins.
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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
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone
Arenite
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary