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        | A form of pottery treatment in which the surface of the pot is polished, using a hard-smooth surface. |  | 
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        | The breaking or cracking of clay. |  | 
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        | Refractory material in a variety of shapes designed to support ware in the kiln. |  | 
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        | An absorbent aluminum silicate clay formed from volcanic ash. |  | 
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        | The process of oxidizing; allowing air into the kiln. |  | 
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        | Any of a group of hard crystalline minerals that consist of aluminum silicates of potassium or sodium or calcium or barium. |  | 
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