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 = 891 K _database_code_amcsd 0006374 4.9972 4.9972 5.4569 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 .0222 .0135 .0111 0 0 O .4155 .20775 1/6 .0554 .0578 .0388 .0277 0 -.0259