sedimentary
Flint
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, waxy luster, conchoidal fracture, and typically brown, grey, or black in color.
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Physical properties
Hardness of 7 on the Mohs scale, waxy luster, conchoidal fracture, and typically brown, grey, or black in color.
Formation & geological history
Formed by the replacement of calcium carbonate by silica in chalk or limestone beds during the Cretaceous period.
Uses & applications
Historically used for making stone tools, weapons, and fire-starting flintlock mechanisms; currently used in abrasives and ceramics.
Geological facts
Flint was one of the earliest materials utilized by humans for knapping sharp-edged tools and projectile points.
Field identification & locations
Identified by its distinctive conchoidal fracture and waxy appearance; commonly found in chalk formations globally.
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