sedimentary
Chert
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically brown, tan, or gray with a waxy to vitreous luster and conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically brown, tan, or gray with a waxy to vitreous luster and conchoidal fracture.
Formation & geological history
Formed through the chemical precipitation of silica-rich solutions or accumulation of siliceous skeletal remains in marine environments.
Uses & applications
Historically used for making stone tools and weapons due to its sharp conchoidal fracture, and occasionally as an ornamental stone.
Geological facts
Prehistoric humans heavily favored chert and flint for knapping arrowheads and blades because of predictable fracture mechanics.
Field identification & locations
Identified easily by its extreme hardness, waxy luster, and sharp conchoidal edges, commonly found embedded in limestone formations.
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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