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 = 859 K _database_code_amcsd 0006372 4.9973 4.9973 5.4572 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 .0218 .0133 .0109 0 0 O .4153 .20765 1/6 .0529 .0572 .0382 .02645 0 -.0258