Cordierite Armbruster T American Mineralogist 71 (1986) 746-757 Role of Na in the structure of low-cordierite: A single-crystal X-ray study Sample: from Haddam, Connecticut, USA _database_code_amcsd 0001020 17.054 9.759 9.324 90 90 90 Cccm atom x y z occ U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3) O11 .24592 -.10438 .35850 .0120 .0080 .0083 -.0004 .0035 -.0007 O16 .06187 -.41574 .34885 .0083 .0102 .0081 -.0014 .0003 -.0032 O13 -.17331 -.30849 .35792 .0094 .0102 .0086 .0011 -.0017 -.0028 O26 .04315 -.24496 0 .0062 .0143 .0190 -.0016 0 0 O21 .11975 .18176 0 .0121 .0114 .0181 .0061 0 0 O23 .16350 -.07847 0 .0144 .0059 .0185 -.0035 0 0 Al11 .25 .25 .25011 .92 .0076 .0061 .0061 .0010 0 0 Be11 .25 .25 .25011 .08 .0076 .0061 .0061 .0010 0 0 Si16 0 .5 .25 .0060 .0066 .0048 0 0 0 Si21 .19179 .07870 0 .0055 .0045 .0061 .0002 0 0 Si23 -.13563 .23635 0 .0051 .0052 .0063 -.0006 0 0 Al26 .05052 .30856 0 .0051 .0058 .0057 .0006 0 0 Mg .33622 0 .25 .66 .0067 .0093 .0085 .0000 0 0 Fe .33622 0 .25 .29 .0067 .0093 .0085 .0000 0 0 Li .33622 0 .25 .05 .0067 .0093 .0085 .0000 0 0 NaCh0 0 0 0 .27 .024 .011 .041 .0010 0 0 OHCh1 0 0 .25 .75 .128 .066 .049 0 0 0