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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 … See more

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    The exact mode of formation of flint is not yet clear, but it is thought that it occurs as a result of chemical changes in compressed sedimentary rock formations during the … See more

    Tools or cutting edges
    Flint was used in the manufacture of tools during the Stone Age as it splits into thin, sharp splinters … See more

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    Mineralogy
    Agate – Rock consisting of cryptocrystalline silica alternating with microgranular quartz See more

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