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 Kemio Island, Finland _database_code_amcsd 0001018 17.065 9.797 9.293 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 .24458 -.10606 .35763 .0135 .0095 .0106 .0001 .0041 -.0001 O16 .06148 -.41548 .34870 .0096 .0115 .0096 -.0013 .0010 -.0034 O13 -.17377 -.30681 .35715 .0116 .0118 .0102 .0011 -.0017 -.0035 O26 .04344 -.24302 0 .0066 .0167 .0203 -.0017 0 0 O21 .11723 .17903 0 .0124 .0128 .0214 .0057 0 0 O23 .16260 -.07703 0 .0150 .0070 .0221 -.0035 0 0 Al11 .25 .25 .25007 .8 .0080 .0070 .0077 .0010 0 0 Be11 .25 .25 .25007 .2 .0080 .0070 .0077 .0010 0 0 Si16 0 .5 .25 .0068 .0075 .0067 0 0 0 Si21 .19092 .07963 0 .0063 .0058 .0087 .0003 0 0 Si23 -.13639 .23546 0 .0060 .0063 .0091 -.0006 0 0 Al26 .04994 .30859 0 .0059 .0064 .0077 .0008 0 0 Mg .33488 0 .25 .38 .0057 .0125 .0091 .0001 0 0 Fe .33488 0 .25 .55 .0057 .0125 .0091 .0001 0 0 Li .33488 0 .25 .07 .0057 .0125 .0091 .0001 0 0 NaCh0 0 0 0 .47 .028 .020 .047 .0000 0 0 OHCh1 0 0 .25 .8 .088 .050 .033 0 0 0