Kaolin, theoretical chemical formula: Al2 [(OH) 4/Si2O5], [5] is a non-metallic mineral, mainly composed of kaolinite group clay minerals and clay rocks. Due to its white and delicate appearance, it is also known as Baiyun soil. Its pure kaolin is white, delicate, and soft in texture, with good physical and chemical properties such as plasticity and fire resistance. Its mineral composition is mainly composed of kaolinite, kaolinite, hydromica, illite, montmorillonite, as well as minerals such as quartz and feldspar.

Physical and chemical properties:

Appearance: Mostly dull, with a delicate white color when pure, and may have gray, yellow, brown, and other colors when containing impurities. The appearance can be loose soil blocks or dense rock blocks depending on the cause.

Density: 2.54-2.60 g/cm3.

Melting point: about 1785 ℃.

It has plasticity, and wet soil can be molded into various shapes without breaking, and can remain unchanged for a long time.