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flint clay:see fire clayfire clay,
clay that has a high degree of resistance to heat. By the best standards it should have a fusion point higher than 1,600°C;. The term "fire clay" is commonly held to exclude kaolin and other refractory potter's clays.
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flint clay[′flint ‚klā]
A hard, smooth, flintlike fireclay; when it is ground, it develops no plasticity, and it breaks with conchoidal fracture.