refractory clay ( synonym found)
Definition of refractory clay:

°Obstinate and unruly; strongly opposed to something.
°Not affected by great heat.
°A material or piece of material, such as a brick, that has a very high melting point.
Definition of refractory clay:

°Obstinate and unruly; strongly opposed to something.
°Not affected by great heat.
°A material or piece of material, such as a brick, that has a very high melting point.
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