sedimentary
Flint
SiO2 (Cryptocrystalline Quartz)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically grey or brownish, waxy to vitreous luster, and exhibits conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically grey or brownish, waxy to vitreous luster, and exhibits conchoidal fracture.
Formation & geological history
Formed through the chemical replacement of limestone or chalk by silica-rich groundwaters over millions of years.
Uses & applications
Historically used for making stone tools and fire-starting; currently collected as a geological specimen.
Geological facts
Flint played a crucial role in human technological evolution during the Stone Age due to its predictable fracturing.
Field identification & locations
Identified by its sharp conchoidal edges and ability to spark when struck with steel; commonly found within chalk formations.
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