2. What is the composition of kaolin

2. What is the composition of kaolin?

Kaolin minerals are composed of kaolinite, dickite, perlite, halloysite and other kaolinite cluster minerals. The main mineral composition is kaolinite.

The crystal chemical formula of kaolinite is 2SiO 2 Al2O3 2H 2. Its theoretical chemical composition is 46.54% SiO 2, 39.5% Al2O3 and 13.96% H 2. Kaolin minerals belong to 1:1 type layered silicate. The crystals are mainly composed of silica-oxygen tetrahedron and Shaohe-hydroxide octahedron, in which silica-oxygen tetrahedron is connected along two-dimensional direction with a common apex angle to form a hexagonal grid layer, and each silica-oxygen tetrahedron has a non-common apex oxygen facing one side. The top oxygen of the common silicon-oxygen tetrahedron layer in the oxygen octahedron layer forms a 1:1 unit layer [1].