Hydrogen Mao H K, Jephcoat A P, Hemley R J, Finger L W, Zha C S, Hazen R M, Cox D E Science 239 (1988) 1131-1133 Synchrotron X-ray diffraction measurements of single-crystal hydrogen to 26.5 Gigapascals Locality: synthetic Sample: at P = 26.5 GPa, T = 300 K _database_code_amcsd 0015436 2.259 2.259 3.609 90 90 120 P6_3/mmc atom x y z H 1/3 2/3 .25