sedimentary
Limestone
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness 3 on Mohs scale, colors range from white to gray and tan, earthy to vitreous luster, fine-grained or crystalline structure.
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Physical properties
Hardness 3 on Mohs scale, colors range from white to gray and tan, earthy to vitreous luster, fine-grained or crystalline structure.
Formation & geological history
Formed from the accumulation of skeletal fragments of marine organisms like coral, algal, and molluscs in shallow marine environments over millions of years.
Uses & applications
Widely used in construction as building material, aggregate for roads, and as a raw material for manufacturing cement and lime.
Geological facts
Limestone often contains well-preserved fossils and dissolves slowly in weak acid solutions like rainwater.
Field identification & locations
Easily identified by its reaction with dilute hydrochloric acid, producing carbon dioxide bubbles; 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