Tridymite Kihara K, Matsumoto T, Imamura M Zeitschrift fur Kristallographie 177 (1986) 27-38 Structural change of orthorhombic-I tridymite with temperature: A study based on second-order thermal-vibrational parameters Note: Dollase's model, T = 693 K Locality: synthetic refractory silica brick _database_code_amcsd 0020935 8.742 5.047 8.262 90 90 90 *C222_1 0 0 .25 atom x y z B(1,1) B(2,2) B(3,3) B(1,2) B(1,3) B(2,3) Si .1673 .5099 .4378 .0121 .0341 .0118 -.0003 -.0006 -.0018 O1 .3275 0 .75 .344 .1023 .0131 .0068 O2 0 .5252 .5 .0127 .1699 .0365 .0082 O3 .2487 .2655 .5049 .0400 .0762 .0385 .0263 -.0069 .0132