sedimentary
Chert
Microcrystalline quartz (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, waxy or vitreous luster, conchoidal fracture, and colors ranging from white to brown and black.
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Physical properties
Hardness of 7 on the Mohs scale, waxy or vitreous luster, conchoidal fracture, and colors ranging from white to brown and black.
Formation & geological history
Formed by the chemical precipitation of silica from aqueous solutions or the accumulation of siliceous microfossil remains over millions of years.
Uses & applications
Historically used for making stone tools and arrowheads due to its sharp conchoidal fracture.
Geological facts
Chert that is dark or black in color is commonly referred to as flint.
Field identification & locations
Found globally within limestone and chalk formations; identified easily by its extreme hardness and glassy, curved fracture surfaces.
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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
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
fossil
Sandstone
Arenite
sedimentary
Shale
Shale (clastic sedimentary rock)
sedimentary
Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
sedimentary