sedimentary
Flint
SiO2 (Cryptocrystalline Quartz)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically gray or white with a waxy luster and conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically gray or white with a waxy luster and conchoidal fracture.
Formation & geological history
Formed through the replacement of calcium carbonate by silica-rich solutions in chalk or limestone formations over millions of years.
Uses & applications
Historically used for making stone tools and sparking fire; modern use includes abrasive grit and ceramics.
Geological facts
Flint has been utilized by humans since the Stone Age due to its ability to fracture into extremely sharp edges.
Field identification & locations
Identify by its conchoidal fracture, sharp edges, and ability to scratch glass easily; found worldwide in chalk deposits.
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