sedimentary
Flint
Silicon dioxide (Microcrystalline Quartz, SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, dark grey to black color, waxy to vitreous luster, conchoidal fracture with no cleavage.
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Physical properties
Hardness of 7 on the Mohs scale, dark grey to black color, waxy to vitreous luster, conchoidal fracture with no cleavage.
Formation & geological history
Formed through the chemical replacement of calcium carbonate in limestone by silica-rich solutions in marine environments over millions of years.
Uses & applications
Historically used for making stone tools and sparking fire; modern uses include landscaping and decorative items.
Geological facts
Flint produces sparks when struck against steel due to its high hardness and brittle conchoidal fracture.
Field identification & locations
Identify by its dark color, waxy luster, and sharp conchoidal edges. Commonly found embedded in chalk or limestone formations worldwide.
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