Digitalfire Ceramic Minerals Directory

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Mineral: Kaolinite

Notes

The most fundamental clay mineral. It is weathered from rock and deposited in layers and lenses in nearby valleys. Kaolin (also called China Clay) is a pure clay mineral crystal of one part alumina and two parts silica. Most other clay minerals are derivatives of kaolin. Kaolin particles are flat and comparatively the largest of all clay minerals. They have a surface chemistry that gives them an affinity for water. The attached water both 'glues' particles together and acts as a 'buffer' to lubricate particle-against-particle movement in the plastic matrix.

Kaolins are whiter and cleaner than other clays because they are mined near the site where they were weathered and altered from the parent rock. Kaolin ore is mixed with other rocks and impurities which have to be separated using various wet and dry processing methods.

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