Silicon Dioxide, commonly known as QUARTZ or SILICA, is a naturally occurring compound composed of two oxygen atoms and one silicon atom. It is found in many forms, including sand, QUARTZ, and flint. QUARTZ is the most common form of Silicon Dioxide and is used in many industries, such as glassmaking, electronics, and construction. SILICA is also used in many products, such as cosmetics, toothpaste, and food additives. Silicon Dioxide is an important component of many materials, and its properties make it useful for a variety of applications.