sedimentary
Flint
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically white-gray to dark brown or black in color, waxy to vitreous luster, and exhibits conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically white-gray to dark brown or black 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 making stone tools and fire-starting, and modernly utilized for landscaping or decorative gravel.
Geological facts
Flint and chert are chemically identical, but flint specifically refers to varieties found in chalk or marly limestone.
Field identification & locations
Easily identified by its distinctive conchoidal fracture, sharp edges when broken, and ability to spark when struck with steel.
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