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Track across front of traditional flint cottage in Sussex, UK.Flint is a hard, sedimentary cryptocrystalline form of the mineral quartz. It occurs chiefly as nodules and masses in sedimentary rocks, such as chalks and limestones. Flint, knapped or unknapped, has been used from antiquity up to the present day as a material for building stone walls, using lime mortar, and often combined with other available stone or brick rubble. It was most common in parts of southern England, where no good building stone was available locally, and brick-making not widespread until the later Middle Ages.