sedimentary
Chert
Microcrystalline quartz (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, typically gray, brown, or white with a waxy luster and conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, typically gray, brown, or white with a waxy luster and conchoidal fracture.
Formation & geological history
Formed through the chemical precipitation of silica-rich fluids or accumulation of siliceous skeletal remains in marine environments.
Uses & applications
Historically used for making stone tools and weapons due to its sharp conchoidal fracture; occasionally used for landscaping and decorative gravel.
Geological facts
Chert forms nodules within limestone or chalk formations and includes varieties like flint and jasper.
Field identification & locations
Identified by its extreme hardness, waxy appearance, and sharp edges when fractured. Found worldwide in sedimentary rock layers.
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