Clay: Clay designates a natural rock material based on hydrated silicates or aluminosilicates with a lamellar structure, generally resulting from the alteration of silicates with a three-dimensional framework, such as feldspars. It can be a locally abundant material, very diverse, treated or refined before use, both loose or plastic (often after adding water) or with drying, absorbing or degreasing power, even with sticky or even refractory properties, etc. .
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