sedimentary
Limestone
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness of 3 on the Mohs scale, typically gray, white, or tan in color, with a dull to earthy luster. Composed mainly of calcite and aragonite with a fine-grained to microcrystalline structure.
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Physical properties
Hardness of 3 on the Mohs scale, typically gray, white, or tan in color, with a dull to earthy luster. Composed mainly of calcite and aragonite with a fine-grained to microcrystalline structure.
Formation & geological history
Formed through the accumulation and compaction of organic debris like shells and coral, or chemical precipitation in shallow marine environments over millions of years.
Uses & applications
Widely used in the manufacture of cement, as crushed stone for road construction, and as a soil conditioner in agriculture.
Geological facts
Limestone frequently contains well-preserved fossils and forms dramatic karst landscapes featuring caves and sinkholes.
Field identification & locations
Easily identified by its vigorous effervescence when treated with hydrochloric acid, common 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
fossil
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone
Arenite
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary