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Kyanites
"A hard and refractory mineral occurring in metamorphic rocks. Kyanite, the softest variety is reconstituted as sillimanite kiln shelves, props etc. and used as a low-thermal-expansion grog in raku bodies."
- The Potter's Dictionary of Materials and Techniques
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 A refractory material used to reduce shrinkage in clay bodies. Because of its interlocking crystal structure it also gives strength to clay bodies.
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A refractory material used to reduce shrinkage in clay bodies. Because of its interlocking crystal structure it also gives strength to clay bodies.
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A refractory material used to reduce shrinkage in clay bodies. Because of its interlocking crystal structure it also gives strength to clay bodies.
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A refractory material used to reduce shrinkage in clay bodies. Because of its interlocking crystal structure it also gives strength to clay bodies.
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