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 = 813 K _database_code_amcsd 0006368 4.9728 4.9728 5.4425 90 90 120 *P3_221 0 0 .6666666666666667 atom x y z B(1,1) B(2,2) B(3,3) B(1,2) B(1,3) B(2,3) Si .4816 0 0 .0219 .0172 .0118 .0086 .0002 .0004 O .4173 .2474 .1363 .0487 .0417 .0262 .0286 -.0048 -.0150