Kaolinite

Kaolinite is a clay mineral, part of the group of industrial
minerals, with the chemical composition Al2Si2O5(OH)4.

Kaolinite is a clay mineral, part of the group of industrial 
minerals, with the chemical composition Al2Si2O5(OH)4. It is a 
layered silicate mineral, with one tetrahedral sheet linked through 
oxygen atoms to one octahedral sheet ofalumina octahedra.[4] Rocks 
that are rich in kaolinite are known as china clay, white clay, or 
kaolin.

Kaolin is used in ceramics, medicine, coated paper, as a food 
additive, in toothpaste, as a light diffusing material in white 
incandescent light bulbs, and in cosmetics. It is generally the main 
component in porcelain.

It is also used in paint to extend titanium dioxide (TiO2) and modify 
gloss levels; in rubber for semi-reinforcing properties; and in 
adhesives to modify rheology.[8]

Kaolin was long used in the production of common smoking pipes in 
Europe and Asia.

The largest use is in the production of paper, including ensuring the 
gloss on some grades of paper. Commercial grades of kaolin are 
supplied and transported as dry powder, semi-dry noodle or as liquid 
slurry.

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