Quartz Kihara K European Journal of Mineralogy 2 (1990) 63-77 An X-ray study of the temperature dependence of the quartz structure Sample: at T = 854 K _database_code_amcsd 0006371 4.9968 4.9968 5.4576 90 90 120 P6_222 atom x y z B(1,1) B(2,2) B(3,3) B(1,2) B(1,3) B(2,3) Si .5 0 0 .0278 .0214 .0131 .0107 0 0 O .4157 .20785 1/6 .0533 .0577 .0383 .02665 0 -.0261