sedimentary
Flint
SiO2 (Cryptocrystalline Quartz)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically dark gray or black with a waxy luster and conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically dark gray or black with a waxy luster and conchoidal fracture.
Formation & geological history
Formed through the chemical replacement of limestone or chalk by silica-rich groundwaters in marine environments.
Uses & applications
Historically used for making stone tools and fire-starting, and currently used in decorative landscaping and abrasives.
Geological facts
Flint played a critical role in human survival and technological development during the Stone Age due to its ability to hold a sharp edge.
Field identification & locations
Identified by its conchoidal fracture and ability to spark when struck against steel; commonly found within chalk and limestone formations globally.
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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
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Fossiliferous Sedimentary Rock
Sedimentary limestone with invertebrate fossil imprint
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Sandstone or Siltstone
Arenite (if sandstone)
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Sandstone
Arenite
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Shale
Shale (clastic sedimentary rock)
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Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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