Silica (SiO2) is a group of minerals consisting of silicon and oxygen, and is divided into various groups size, shape and crystal structure. Consists of Silica Stone, Silica Granules, and Silica Sand. Various sizes Silica is useful as a raw material for the aggregate & instant cement industry, water filtration process (water treatment), processing industry, sand blasting, glass-making raw materials, as well as materials for making molds