sedimentary
Chert
Microcrystalline quartz (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, waxy luster, conchoidal fracture, and colors ranging from brown to grey.
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Physical properties
Hardness of 7 on the Mohs scale, waxy luster, conchoidal fracture, and colors ranging from brown to grey.
Formation & geological history
Formed through the chemical precipitation of silica from aqueous solutions or the accumulation of siliceous skeletal remains in marine environments.
Uses & applications
Historically used for making stone tools and weapons due to its sharp conchoidal fracture; currently used as aggregate and in abrasive products.
Geological facts
Chert has been utilized by humans for millions of years to craft durable blades, scrapers, and arrowheads.
Field identification & locations
Identify by its distinct waxy luster, extreme hardness, and sharp curved fracture edges. Commonly found within limestone or chalk formations.
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Sandstone or Siltstone
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Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)
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