SiO2 (silicon dioxide)

Silicon dioxide (SiO₂), also known as silica, is a chemical compound composed of silicon and oxygen atoms. It naturally occurs as quartz and in many minerals. Silica is a hard, crystalline substance with a high melting point, making it essential in making glass, ceramics, and concrete. It is also used in the electronics industry for semiconductor components due to its insulating properties. In nature, silica contributes to the structure of sand and various rocks. Its stability and durability make it a fundamental material across construction, technology, and manufacturing applications.