Kaolin is a clayey rock (lamellar silicate), which is white or yellowish, soft, and composed mainly of the mineral kaolinite. It is formed in the processes of weathering or hydrothermal decomposition of igneous and metamorphic rocks rich in feldspar. Kaolin, also called porcelain clay, is a sedimentary rock that contains minerals such as kaolinite, quartz and mica. Kaolin deposits are found all over the world, with the richest deposits in China, hence the name, from the Chinese mountain Gaoling (Chinese "High Mountain"), the place of extraction. As China is one of the largest producers of kaolin, it is also commonly ...