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Home > Resources > Glossary > Definitions - C > Clay

Clay

1. Fine-grained earth materials formed by the decomposition of igneous rock; when combined with water, clay is plastic enough to be shaped; when dry, it is strong; when subjected to red heat or above, it will become progressively more dense and rock-like. 2. A compound of decomposed and altered feldspathic rock consisting of various hydrated silicates of aluminum along with non-plastics, such as quartz, and organic matter. It is also used as a source of alumina and silica in glazes.

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