china clay 
noun
Another term for kaolin.In 1746 William Cookworthy, a Plymouth chemist, recognized the occurrence of kaolin in Cornwall, in south-west England, and subsequently manufactured porcelain from Cornish china clay....
- Following Meissen and Sèvres products, British potters began to use china clay or kaolin, when in 1768 William Cookworthy, a Plymouth chemist, proved the potential of the kaolin reserves of Cornwall.
- Surprisingly, many of these are inorganic minerals; for example talc and kaolin or china clay.