Flint is a very fine-grained hard rock usually found as lumps (nodules) in chalk. It is black, dark grey or tan and will splinter and spark when struck.
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How is it formed?
Flint forms during or after the chalk in which it is found. Flint nodules grow within the sediment by being precipitated from solutions which are rich in silica. The silica probably came from the silica-rich skeletons of the animals which make up the chalk.
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