Kaolin

 

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 onetetrahedral sheet linked through oxygen atoms to one octahedral sheet of alumina octahedra. Rocks that are rich in kaolinite are known as kaolin or china clay.

The name is derived from Chinese Kao-Ling (高岭/高嶺, pinyin Gāolǐng), a village near JingdezhenJiangxi provinceChina. The name entered English in 1727 from the French version of the word: "kaolin", following Francois Xavier d'Entrecolles's reports from Jingdezhen. In Africa, kaolin is sometimes known as kalaba(in Gabon and Cameroon), calaba, and calabachop (in Equatorial Guinea).

Kaolinite has a low shrink-swell capacity and a low cation exchange capacity (1-15 meq/100 g). It is a soft, earthy, usually white mineral (dioctahedral phyllosilicate clay), produced by the chemical weathering of aluminium silicate minerals like feldspar. In many parts of the world, it is colored pink-orange-red byiron oxide, giving it a distinct rust hue. Lighter concentrations yield white, yellow or light orange colors. Alternating layers are sometimes found, as at Providence Canyon State Park in GeorgiaUnited States. Commercial grades of kaolin are supplied and transported as dry powder, semi-dry noodle or as liquid slurry.

 

 

For further information, please click on the link below:

http://en.wikipedia.org/wiki/Kaolinite

 

 

 



Source:

 

Wikipedia, The Free Encyclopedia

 

 


 

 

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