sedimentary
Chert
Silicon dioxide (Microcrystalline quartz)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, waxy luster, conchoidal fracture, and colors ranging from white to brown and black.
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Physical properties
Hardness of 7 on the Mohs scale, waxy luster, conchoidal fracture, and colors ranging from white to brown and black.
Formation & geological history
Formed via the accumulation of siliceous skeletal remains or chemical precipitation in marine environments during various geological eras.
Uses & applications
Historically used for making stone tools and weapons due to its sharp edges when fractured; modern use includes abrasives and aggregates.
Geological facts
Chert is extremely durable and often weathers out of limestone formations as nodules. Flint is a well-known variety of chert.
Field identification & locations
Identified by its conchoidal fracture and high hardness, it is commonly found globally within chalk or limestone deposits.
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