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Flint, occasionally flintstone, is a sedimentary cryptocrystalline form of the mineral quartz, categorized as the variety of chert that occurs in chalk or marly limestone. Historically, flint was widely used to make stone tools and start fires. Flint occurs chiefly as nodules and masses in sedimentary rocks, such as chalks and limestones.
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Apr 25, 2024 · Ten years ago, a water crisis began in Flint, Mich. Lead tainted the drinking water. A decade later, people are still asking if the water is safe to drink. Michigan Public's Steve Carmody reports ...
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Flint is a hard, tough chemical or biochemical sedimentary rock that breaks with a conchoidal fracture. It is a form of microcrystalline quartz that is typically called "chert" by geologists. Flint often forms as nodules in sedimentary rocks such as chalk and marine limestones.
Apr 24, 2024 · April 24, 2024, 11:54 AM PDT. By Maggie Vespa, Samira Puskar and Erik Ortiz. FLINT, Mich. — Ten years ago, smiling politicians posed for cameras while pushing a button, swapping the main tap ...
Flint is a high-quality variety of chert, a biochemical sedimentary rock made of cryptocrystalline quartz. It is very hard, with characteristic conchoidal fracturing that makes it exceptionally useful for the creation of tools like arrowheads. Flint comes in many colors but is usually dark gray or black.
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