china clay
noun/ˌtʃaɪnə ˈkleɪ/
/ˌtʃaɪnə ˈkleɪ/
(also kaolin)
[uncountable]- a type of fine white clay used in some medicines and in making porcelain for cups, plates, etc.
- The cups are made from the finest china clay.
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china clay