sedimentary
Banded Chert
Microcrystalline quartz (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, waxy luster, concoidal fracture, colors range from gray to brown with distinct light and dark bands.
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Physical properties
Hardness of 7 on the Mohs scale, waxy luster, concoidal fracture, colors range from gray to brown with distinct light and dark bands.
Formation & geological history
Formed through the chemical precipitation of silica from aqueous solutions or the accumulation of siliceous microfossils in marine environments.
Uses & applications
Historically used for making stone tools and arrowheads due to its sharp edges when fractured.
Geological facts
Banded chert forms distinct alternating layers reflecting variations in deposition conditions over long geological periods.
Field identification & locations
Identified easily by its extreme hardness, waxy luster, and sharp concoidal breakage; commonly found in limestone formations.
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