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 = 848 K _database_code_amcsd 0006370 4.9965 4.9965 5.4570 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 .0279 .0212 .0132 .0106 0 0 O .4152 .2076 1/6 .0521 .0576 .0388 .02605 0 -.0269