Commercially, Silicon is purified by heating sand and carbon in an electric furnace. A molten salt electrolysis method is applied to obtain ultrapure silicon. Silicon is the eighth most plentiful element during the universe by mass, but it's only exceptionally seldom observed like a pure element from the Earth’s crust. https://american-glass-lined-duct82470.wikihearsay.com/3629695/5_essential_elements_for_sic_heating_element