In nature, silicon (Latin silicium) occurs mainly in the form of the above-mentioned silicates and silica with the formula SiO2. The silicon content in the lithosphere is 276,000 [ppm], and in terms of quantity, it’s second behind oxygen. Under the influence of water and carbon dioxide, silicates are broken down into the final product, which is silica, for example, quartz sand. Its best-known form is the transparent mountain crystal, which, similar to black flint, is used to make silicon water.