Flint/ chert

Updated Thursday, 28th September 2006
A brief description of the nature of flint or chert

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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.

Flint or chert

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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