sedimentary
Limestone
Sedimentary carbonate rock (CaCO3)
AI-generated identification · may be incorrectHardness of 3 on Mohs scale, typically gray, white, or buff colored, with a dull to earthy luster and a fine-grained to microcrystalline structure.
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Physical properties
Hardness of 3 on Mohs scale, typically gray, white, or buff colored, with a dull to earthy luster and a fine-grained to microcrystalline structure.
Formation & geological history
Formed by the accumulation and compaction of organic skeletal fragments like coral, algal, and foraminifera debris in shallow marine environments over millions of years.
Uses & applications
Widely used in construction as building stone, aggregate for concrete, in the production of lime and cement, and in agriculture to neutralize acidic soils.
Geological facts
Limestone frequently preserves well-known fossils and is the primary rock type that forms caves and spectacular karst topography through chemical weathering.
Field identification & locations
Easily identified in the field by its characteristic reaction to dilute hydrochloric acid, producing visible fizzing due to carbon dioxide release.
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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