China clay / Kaolin China Clay is also known as kaolin & white clay. Primary clay formed by natural kaolinization process. The chemical formula for china clay used in mineralogy is Al2Si2O5(OH4). Silica Sand Silicon dioxide (SiO2), also known as silica. It is a natural compound made of two of the earth's most abundant materials: silicon (Si) and oxygen (O2). Silicon dioxide is most often recognized as silica sand. Bentonite Bentonite is a clay mineral, It is an absorbent swelling clay consisting of mineral Montmorillonite. The Bentonite found in the Kutch region of India is of igneous origin.
