sedimentary
Flint
Microcrystalline quartz (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically dark gray or black with a waxy to dull luster and conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically dark gray or black with a waxy to dull luster and conchoidal fracture.
Formation & geological history
Formed by the chemical replacement of calcium carbonate in limestone or chalk by silica-rich solutions over millions of years.
Uses & applications
Historically used for making stone tools, weapons, and fire-starting flint-and-steel sets.
Geological facts
Flint produces sparks when struck against steel due to its high hardness, making it crucial for historical fire generation.
Field identification & locations
Identified by its conchoidal fracture and waxy luster; commonly found embedded in chalk or limestone deposits worldwide.
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