 Beryllium hydroxide created using either the sinter or melt method is then converted into beryllium fluoride or beryllium chloride . To form the fluoride , aqueous ammonium hydrogen fluoride is added to beryllium hydroxide to yield a precipitate of ammonium tetrafluoroberyllate , which is heated to 1 @,@ 000 ° C ( 1 @,@ 830 ° F ) to form beryllium fluoride . Heating the fluoride to 900 ° C ( 1 @,@ 650 ° F ) with magnesium forms finely divided beryllium , and additional heating to 1 @,@ 300 ° C ( 2 @,@ 370 ° F ) creates the compact metal . Heating beryllium hydroxide forms the oxide , which becomes beryllium chloride when combined with carbon and chlorine . Electrolysis of molten beryllium chloride is then used to obtain the metal . 
