sedimentary
Limestone
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness of 3 on Mohs scale, typically white, gray, or yellowish. Dull to earthy luster with a fine-grained crystal structure.
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Physical properties
Hardness of 3 on Mohs scale, typically white, gray, or yellowish. Dull to earthy luster with a fine-grained crystal structure.
Formation & geological history
Formed from the accumulation of skeletal fragments, coral, algal, and fecal debris in shallow marine environments over millions of years.
Uses & applications
Extensively used in construction, cement production, agriculture to neutralize acidic soils, and as a dimension stone.
Geological facts
Limestone often contains well-preserved fossils of ancient marine organisms and dissolves easily in acidic groundwater to form caves and karst topography.
Field identification & locations
Easily identified by its vigorous effervescence when cold dilute hydrochloric acid is applied. Found worldwide in sedimentary basins and ancient sea beds.
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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
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