Quartz Levien L, Prewitt C T, Weidner D J American Mineralogist 65 (1980) 920-930 Structure and elastic properties of quartz at pressure P = 1 atm _database_code_amcsd 0000789 4.916 4.916 5.4054 90 90 120 *P3_221 0 0 .666666667 atom x y z B(1,1) B(2,2) B(3,3) B(1,2) B(1,3) B(2,3) Si .4697 0 0 .0093 .0078 .0049 .0039 -.00001 -.00002 O .4135 .2669 .1191 .0190 .0144 .0083 .0106 -.00250 -.0035