ball clay
nounEtymology
Clay of this kind found in Dorset and Devon, England, used to be cut into balls that weighed 30 pounds.
Definitions
A type of clay that commonly consists of 20-80% kaolinite, 10-25% mica, and 6-65% quartz.
The neighborhood
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sense glosses and etymology drawn from English Wiktionary · source · CC-BY-SA