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 = 697 K _database_code_amcsd 0006366 4.9509 4.9509 5.4285 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 .4764 0 0 .0176 .0135 .0095 .00675 -.00005 -.0001 O .4157 .2555 .1281 .0394 .0316 .0196 .0228 -.0050 -.0113