sedimentary
Chert Pebble
Microcrystalline Quartz (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, waxy to dull luster, conchoidal fracture, and colors ranging from white to gray and brown.
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Physical properties
Hardness of 7 on the Mohs scale, waxy to dull luster, conchoidal fracture, and colors ranging from white to gray and brown.
Formation & geological history
Formed through the chemical precipitation of silica in marine environments or replacement of limestone over millions of years.
Uses & applications
Historically used for making stone tools and arrowheads due to its sharp edges when fractured; commonly used today in landscaping and gravel.
Geological facts
Chert weathering often develops a chalky outer rind known as cortex, while flint is a well-known dark variety associated with chalk deposits.
Field identification & locations
Easily identified by its extreme hardness, smooth water-worn surface, and conchoidal fracture patterns; found globally in riverbeds and limestone formations.
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Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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