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- china clay. Cornwall 250 . Cornish Alps:
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ornwalls , 10000 : -
"China clay, as the name suggests, is a material known as kaolin, which was first used in China more than ten thousand years ago to make fine white porcelain. Some of this eventually made it's way to Europe, where the gentry still had to make do with crude earthenware pots, and porcelain was highly sought-after. " http://www.cornwalls.co.uk/history/industrial/china_clay.htm