Dictionary of Human Evolution and Biology

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Dark variety of chert that forms as nodules, usually in chalk; the primary component is silica, and is considered an opaque variety of chalcedony. Because of a tendency to form conchoidal fractures, flint was often used as a substrate for stone tools, especially in the European Neolithic. Flint apparently does not occur in Africa, where a related mineral, chert, is frequently utilized.

See cryptocrystalline siliceous rock.

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