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Flint is a hard, sedimentary cryptocrystalline form of the mineral quartz, categorized as a variety of chert. It occurs chiefly as nodules and masses in sedimentary rocks, such as chalks and limestones.

  en.wikipedia.org

  www.bls.gov

  www.masterstudies.com

  www.payscale.com

  fred.stlouisfed.org

  flint.craigslist.org

  www.umflint.edu

  ieconomics.com

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