sedimentary
Flint
SiO2 (Microcrystalline Quartz)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, grayish-white to dark gray color with a waxy to vitreous luster, conchoidal fracture, and no cleavage.
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Physical properties
Hardness of 7 on the Mohs scale, grayish-white to dark gray color with a waxy to vitreous luster, conchoidal fracture, and no cleavage.
Formation & geological history
Forms by the replacement of calcium carbonate by silica-rich solutions in chalk or limestone formations over millions of years.
Uses & applications
Historically used for making stone tools and fire-starting, and currently used in abrasives and decorative landscaping.
Geological facts
Flint is extremely durable and breaks with razor-sharp edges, making it ideal for prehistoric weaponry and primitive tools.
Field identification & locations
Identify by its distinct conchoidal fracture and waxy luster; commonly found embedded in chalk or limestone deposits globally.
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