sedimentary
Agated Chert
Microcrystalline Quartz (SiO2)
Hardness of 7 on the Mohs scale, colors ranging from white and cream to brown and red due to iron oxide impurities, waxy to vitreous luster, cryptocrystalline structure with conchoidal fracture.
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Physical properties
Hardness of 7 on the Mohs scale, colors ranging from white and cream to brown and red due to iron oxide impurities, waxy to vitreous luster, cryptocrystalline structure with conchoidal fracture.
Formation & geological history
Formed in sedimentary environments by the replacement of calcium carbonate in limestone by silica-rich groundwaters, often developing micro-quartz and chalcedony banding over millions of years.
Uses & applications
Used for ornamental carvings, lapidary arts, and as a durable mineral specimen for rock collectors.
Geological facts
Chert and flint have been utilized by humans since prehistoric times for creating sharp tools and weapon points due to its predictable conchoidal fracture.
Field identification & locations
Can be identified by its high hardness (scratches glass), waxy luster, and lack of cleavage. Often found in limestone and chalk deposits globally.
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