sedimentary
Flint
SiO2 (Cryptocrystalline Quartz)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, brown-to-grey color, waxy to vitreous luster, and conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, brown-to-grey color, waxy to vitreous luster, and conchoidal fracture.
Formation & geological history
Formed through the chemical replacement of limestone or chalk by silica-rich groundwater in marine environments.
Uses & applications
Historically used for making stone tools and fire-starting; currently collected as a mineral specimen.
Geological facts
Flint is a hard, tough sedimentary rock that produces sparks when struck against steel due to its high quartz content.
Field identification & locations
Identify by its distinct conchoidal fracture and waxy luster; commonly found embedded in chalk formations worldwide.
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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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Shale
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Shale (or Mudstone/Siltstone)
Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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