sedimentary
Limestone Nodule
Calcium Carbonate (CaCO3)
AI-generated identification · may be incorrectHardness of 3 on the Mohs scale, typically brown or tan in color with an earthy to dull luster, and massive or cryptocrystalline structure.
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Physical properties
Hardness of 3 on the Mohs scale, typically brown or tan in color with an earthy to dull luster, and massive or cryptocrystalline structure.
Formation & geological history
Formed through the accumulation and compaction of marine organisms and mineral precipitation in ancient shallow seas.
Uses & applications
Used primarily in construction, aggregate production, and the manufacture of cement.
Geological facts
Nodules often form around a nucleus like a fossil fragment, creating distinct shapes within sedimentary layers.
Field identification & locations
Identified by its reaction to dilute hydrochloric acid and common occurrence in sedimentary rock formations 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
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