Silica (quartz): Silica, SiO2, is a chemical compound that is composed of one silicon atom and two oxygen atoms. It appears naturally in several crystalline forms, one of which is quartz. Quartz is the second most common mineral on Earth. It has the density of 2.65g/cm3. Silica is odorless and various in color.
Application:
Silica’s powder form is common used to manufacture glass, ceramics, etc.