sedimentary
Flint
Microcrystalline quartz (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, dark grey to black color, waxy to vitreous luster, conchoidal fracture with no cleavage.
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Physical properties
Hardness of 7 on the Mohs scale, dark grey to black color, waxy to vitreous luster, conchoidal fracture with no cleavage.
Formation & geological history
Formed through the chemical replacement of calcium carbonate in limestone by silica-rich solutions in marine environments.
Uses & applications
Historically used for making stone tools and fire-starting; currently used in decorative aggregates, ball mills, and lapidary collections.
Geological facts
Flint has been utilized by humans for over two million years due to its sharp edges when fractured.
Field identification & locations
Easily identified by its distinctive conchoidal fracture and waxy luster; commonly found embedded in chalk or limestone formations.
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