Greenwood, Norman N.; Earnshaw, Alan (1984). Chemistry of the Elements. Oxford: Pergamon Press. p. 245. ISBN0-08-022057-6. states, "Typical compositions for industrially used bauxites are Al2O3 40–60%, combined H2O 12–30%, SiO2 free and combined 1–15%, Fe2O3 7–30%, TiO2 3–4%, F, P2O5, V2O5, etc., 0.05–0.2%"