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China Clay - Al2Si2O5(OH)4

T Kaolin (China Clay) is a hydrated aluminium silicate crystalline mineral, formed over many millions of years by the hydrothermal decomposition of granite rocks. Rocks that are rich in kaolin or kaolinite are known as china clay or white clay. Kaolin can contain very small traces of uranium and thorium, and is therefore useful in radiological dating. Kaolin has also seen some use in organic farming, as a spray applied to crops to deter insect damage, and in the case of apples, to prevent sun scald
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