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 an earthy to vitreous luster and 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 an earthy to vitreous luster and fine-grained crystal structure.
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 a building material, an aggregate for road bases, and as the primary raw material for manufacturing Portland cement.
Geological facts
Limestone frequently contains well-preserved fossils of ancient marine organisms and dissolves slowly in acidic water to form spectacular cave systems.
Field identification & locations
Easily identified in the field by its characteristic fizzing reaction when exposed to dilute hydrochloric acid due to the release of carbon dioxide.
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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)
Sedimentary
Sandstone
Arenite
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary