Chert is a sedimentary rock consisting almost entirely of silica (SiO 2), and can form in a variety of ways. Biochemical chert is formed when the siliceous skeletons of marine plankton are dissolved during diagenesis, with silica being precipitated from the resulting solution.
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Chert
Form of rock
Chert is a hard, fine-grained sedimentary rock composed of microcrystalline or cryptocrystalline quartz, the mineral form of silicon dioxide. Chert is characteristically of biological origin, but may also occur inorganically as a chemical... Wikipedia
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Chert and flint occur as individual nodules or layers of nodules in limestone or dolomite; they are common in rocks of all ages (notably in the Cretaceous chalk ...