sedimentary
Chert / Flint
Microcrystalline quartz (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, waxy luster, conchoidal fracture, and colors ranging from brown to grey.
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Physical properties
Hardness of 7 on the Mohs scale, waxy luster, conchoidal fracture, and colors ranging from brown to grey.
Formation & geological history
Formed via the chemical precipitation of silica in marine environments or the replacement of limestone, spanning various geological ages.
Uses & applications
Historically used for making stone tools and weapons; currently used in abrasives, landscaping, and decorative aggregates.
Geological facts
Ancient humans prized it for its sharp edges when fractured, making it essential for arrowheads and hand axes.
Field identification & locations
Identify by its distinctive conchoidal fracture, sharp edges, and inability to be scratched by steel. Found globally in limestone formations.
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