sedimentary
Flint
SiO2 (Cryptocrystalline Quartz)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, dark gray to black color, waxy to vitreous luster, and conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, dark gray to black color, waxy to vitreous luster, and conchoidal fracture.
Formation & geological history
Formed through the chemical replacement of limestone or chalk by silica-rich solutions in marine environments.
Uses & applications
Historically used for making stone tools and striking fire, and currently used in landscaping and as a decorative stone.
Geological facts
Flint is extremely durable and breaks with sharp edges, making it the premier material for primitive weaponry.
Field identification & locations
Identify by its conchoidal fracture, waxy luster, and ability to scratch glass easily.
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