sedimentary
Flint
SiO2 (Microcrystalline Quartz)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, waxy luster, conchoidal fracture, and typically brown, grey, or black in color.
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Physical properties
Hardness of 7 on the Mohs scale, waxy luster, conchoidal fracture, and typically brown, grey, or black in color.
Formation & geological history
Formed through the chemical replacement of limestone or chalk by silica-rich solutions in marine environments over millions of years.
Uses & applications
Historically used for making stone tools and sparking fire, and presently collected as a mineral specimen.
Geological facts
Flint flakes shatter with extremely sharp edges, making it the premier material for prehistoric projectile points and cutting implements.
Field identification & locations
Identify by its distinct conchoidal fracture, sharp edges, and ability to easily scratch glass.
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Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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