sedimentary
Limestone
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness of 3 on the Mohs scale, typically white to gray or yellowish in color, with a dull to earthy luster and fine-grained crystal structure.
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Physical properties
Hardness of 3 on the Mohs scale, typically white to gray or yellowish in color, with a dull to earthy luster and fine-grained crystal structure.
Formation & geological history
Formed through the accumulation of skeletal fragments from marine organisms like coral and foraminifera, or chemical precipitation in shallow marine environments over millions of years.
Uses & applications
Widely used in construction as building stone, as an aggregate for road bases, in the manufacture of cement, and for agricultural soil neutralization.
Geological facts
Limestone frequently contains well-preserved fossils and dissolves slowly in acidic water, creating fascinating underground cave systems and karst topography.
Field identification & locations
Easily identified by its characteristic effervescence when exposed to dilute hydrochloric acid; found globally in regions with ancient shallow sea histories.
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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