Some physical properties of raw and calcined flint

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Abstract
Flint from the chalk of north-western Europe has long been an ingredient of ceramic 'bodies'. It is still widely used by British pottery manufacturers in glazed tries and in certain types of tableware. Continental manufacturers also have made some use of it.Flint is more readily converted to cristobalite than are the coarsergrained varieties of quartzose silica. The presence of an adequate amount of cristobalite in the 'body' ensures that, at room-temperature, the glaze-film on the ware shall be under a compressive stress. Thus the development of 'crazing', i.e. of minute tension-fissures in the glaze, tends to be avoided.

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