sedimentary
Limestone
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness of 3 on 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 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 of marine organisms or chemical precipitation of calcium carbonate in shallow marine environments over millions of years.
Uses & applications
Widely used in the construction industry as building stone and for manufacturing Portland cement, as well as in agriculture for soil neutralization.
Geological facts
Limestone often contains well-preserved fossils of ancient marine life and makes up about 10 percent of the total volume of all sedimentary rocks on Earth.
Field identification & locations
Identified easily by its characteristic fizz when exposed to dilute hydrochloric acid; found globally in regions with ancient marine deposition histories.
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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
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Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
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Sandstone
Arenite
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Shale
Shale (clastic sedimentary rock)
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Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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