sedimentary
Banded Chert
Cryptocrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, waxy luster, conchoidal fracture, and distinct microcrystalline layers of varying gray and white shades.
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Physical properties
Hardness of 7 on the Mohs scale, waxy luster, conchoidal fracture, and distinct microcrystalline layers of varying gray and white shades.
Formation & geological history
Formed through the chemical precipitation of silica from seawater or the replacement of limestone by silica-rich solutions over geological timescales.
Uses & applications
Historically used for making stone tools and arrowheads due to its sharp conchoidal fracture; currently collected as a decorative specimen.
Geological facts
Chert forms in marine environments and often contains microfossils of radiolarians or diatoms. Varieties include flint, jasper, and agate depending on impurities.
Field identification & locations
Identified easily by its extreme hardness, waxy sheen, and sharp edges. Commonly found in limestone formations, riverbeds, and glacial tills worldwide.
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