sentence: Sand is a compound of silicon known as silicon dioxide or silica.
sentences_before: There is a lot of silicon on the Earth. At the beach, there is silicon in the form of sand.
sentences_after: The glass can have different colours by adding coloured compounds. Silicon also makes up a lot of different rocks and minerals, and they are known as silicates.
concept_name: sand
headings: Silicon
categories: Semimetals