sedimentary
Flint
Silicon dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically brown or gray in color, waxy to vitreous luster, and exhibits conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically brown or gray in color, waxy to vitreous luster, and exhibits conchoidal fracture.
Formation & geological history
Formed by the replacement of calcium carbonate by silica-rich solutions in chalk or limestone formations during the Cretaceous period.
Uses & applications
Historically used for producing stone tools and fire-starting, and currently used in abrasive manufacturing and decorative gravel.
Geological facts
Flint is a hard variety of the mineral quartz and was heavily utilized by early humans for prehistoric weaponry due to its sharp edges when fractured.
Field identification & locations
Easily identified by its conchoidal fracture, waxy luster, and ability to spark when struck with steel; found worldwide in chalk deposits.
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Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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