sedimentary
Limestone
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness of 3 on the Mohs scale, colors range from white to gray and tan, dull to earthy luster, and reacts vigorously with dilute hydrochloric acid.
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Physical properties
Hardness of 3 on the Mohs scale, colors range from white to gray and tan, dull to earthy luster, and reacts vigorously with dilute hydrochloric acid.
Formation & geological history
Formed by the accumulation of skeletal fragments from marine organisms or direct chemical precipitation in shallow marine environments over millions of years.
Uses & applications
Widely used in construction as building stone, crushed stone for road base, cement production, and agricultural soil conditioning.
Geological facts
Limestone frequently contains well-preserved fossils and forms dramatic landscapes featuring caves, sinkholes, and underground drainage systems known as karst topography.
Field identification & locations
Easily identified by its pale color, relatively soft texture, and characteristic fizzing reaction when exposed to acid. Found worldwide 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
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite
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Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary