Cordierite Gibbs G V American Mineralogist 51 (1966) 1068-1087 The polymorphism of cordierite I: The crystal structure of low cordierite _database_code_amcsd 0000149 17.083 9.738 9.335 90 90 90 Cccm atom x y z occ Biso Al1 1/4 1/4 1/4 .22 Si2 0 1/2 1/4 .92 .20 Al2 0 1/2 1/4 .08 .20 Si3 .1923 .0781 0 .26 Si4 .1351 -.2372 0 .23 Al5 .0506 .3084 0 .96 .25 Si5 .0506 .3084 0 .04 .25 Mg .3374 0 1/4 .77 .23 Fe .3374 0 1/4 .23 .23 O1 .2466 -.1040 .3591 .27 O2 .0616 -.4167 .3494 .24 O3 -.1730 -.3091 .3583 .31 O4 .0434 -.2453 0 .25 O5 .1224 .1848 0 .65 O6 .1639 -.0788 0 .54 Wat 0 0 1/4 .48 7.13 Li 0 0 1/4 .12 7.13 Na 0 0 1/4 .10 7.13 Ca 0 0 1/4 .03 7.13 K 0 0 1/4 .02 7.13