sedimentary
Limestone
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectMohs hardness of 3, colors range from white to gray and yellowish-brown, dull to earthy luster, and it reacts vigorously with dilute hydrochloric acid.
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Physical properties
Mohs hardness of 3, colors range from white to gray and yellowish-brown, dull to earthy luster, and it reacts vigorously with dilute hydrochloric acid.
Formation & geological history
Formed through the accumulation of shell, coral, algal, and fecal debris, often in shallow marine environments over millions of years.
Uses & applications
Widely used in construction as building stone, a primary component of Portland cement, and in agriculture for soil conditioning.
Geological facts
Limestone frequently contains well-preserved fossils of ancient marine organisms and can form massive cave systems through chemical weathering.
Field identification & locations
Identified by its softness, calcareous composition, and effervescence with acid; commonly found in sedimentary basins worldwide.
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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
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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)
sedimentary