sedimentary
Flint
SiO2 (Microcrystalline Quartz)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically yellowish-brown or grey, waxy luster, and conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically yellowish-brown or grey, waxy luster, and conchoidal fracture.
Formation & geological history
Formed chemically or biochemically in marine chalk or limestone deposits over millions of years.
Uses & applications
Historically used for making stone tools and fire-starting; currently used in abrasives and decorative gravel.
Geological facts
Flint and chert are essentially the same material, though flint typically forms in chalk formations and has a dark color.
Field identification & locations
Easily identified by its sharp conchoidal edges, waxy appearance, and ability to spark when struck with steel.
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