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, earthy to vitreous luster, and it reacts with hydrochloric acid by fizzing.
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Physical properties
Hardness of 3 on the Mohs scale, colors range from white to gray and tan, earthy to vitreous luster, and it reacts with hydrochloric acid by fizzing.
Formation & geological history
Formed through the accumulation of skeletal fragments from marine organisms like coral, algal, and foraminifera, typically in shallow marine environments over millions of years.
Uses & applications
Widely used in construction as building material, crushed stone for road base, production of cement, and agricultural soil conditioning.
Geological facts
Limestone often contains well-preserved fossils of ancient marine life and makes up about 10% of the total volume of all sedimentary rocks on Earth.
Field identification & locations
Easily identified by its characteristic effervescence when exposed to acid and its soft, fine-grained texture; found globally in sedimentary basins.
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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
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