sedimentary
Chert
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, conchoidal fracture, waxy luster, and colors ranging from white to gray and brown.
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Physical properties
Hardness of 7 on the Mohs scale, conchoidal fracture, waxy luster, and colors ranging from white to gray and brown.
Formation & geological history
Formed through the chemical precipitation of silica from seawater or the replacement of limestone by silica-rich solutions.
Uses & applications
Historically used for making stone tools and weapons due to its sharp edges when fractured.
Geological facts
Chert is extremely durable and often survives weathering better than the surrounding limestone host rock.
Field identification & locations
Identified easily by its distinctive conchoidal fracture and high hardness that scratches glass.
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Fossiliferous Sedimentary Rock
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Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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