sedimentary
Flint
SiO2 (Microcrystalline Quartz)
AI-generated identification · may be incorrectMohs hardness of 7, waxy to vitreous luster, conchoidal fracture, and typically brown, grey, or white color.
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Physical properties
Mohs hardness of 7, waxy to vitreous luster, conchoidal fracture, and typically brown, grey, or white color.
Formation & geological history
Formed through the replacement of calcium carbonate by silica-rich solutions in chalk or limestone formations.
Uses & applications
Historically used for making stone tools and fire-starting; currently utilized in abrasives and decorative landscaping.
Geological facts
Flint has been utilized by humans for over two million years to create sharp blades, arrowheads, and striking tools.
Field identification & locations
Identify by its distinct conchoidal fracture, sharp edges when broken, and ability to spark when struck with steel.
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