A cryptocrystalline variety of Quartz - found in layers and nodules in sedimentary rocks, typically light in color. Technically, it is a "rock" - not a mineral - but it is usually classified as a variety of Quartz for convenience's sake, since it is usually composed largely of quartz grains with few other minerals involved.
Chert is similar to flint, but light in color, and formed in a somewhat different environment.
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