sedimentary
Chert
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, dull to waxy luster, conchoidal fracture, and typically white, grey, or brown.
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Physical properties
Hardness of 7 on the Mohs scale, dull to waxy luster, conchoidal fracture, and typically white, grey, or brown.
Formation & geological history
Formed through the chemical precipitation of silica-rich fluids or accumulation of siliceous microfossil remains in marine environments.
Uses & applications
Historically used for making stone tools and weapons due to its sharp conchoidal fracturing; currently used in aggregate and landscaping.
Geological facts
Chert forms nodules or beds within limestone and chalk formations and includes varieties like flint and jasper.
Field identification & locations
Identify in the field by its extreme hardness, lack of cleavage, and sharp, glass-like conchoidal fracture edges; common 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