Glaucophane Papike J J, Clark J R American Mineralogist 53 (1968) 1156-1173 The crystal structure and cation distribution of glaucophane _database_code_amcsd 0000182 9.541 17.740 5.295 90 103.67 90 C2/m atom x y z occ Biso Mg1 0 .0908 .5 .84 .38 Fe1 0 .0908 .5 .16 .38 Al2 0 .1807 0 .91 .26 Fe2 0 .1807 0 .09 .26 Mg3 0 0 0 .71 .24 Fe3 0 0 0 .29 .24 Na4 0 .2772 .5 .98 .80 Ca4 0 .2772 .5 .02 .80 Si1 .2831 .0871 .2931 .31 Si2 .2920 .1730 .8087 .29 O1 .1092 .0927 .2037 .50 O2 .1177 .1714 .7480 .50 OH3 .1126 0 .7088 .65 O4 .3679 .2529 .8058 .61 O5 .3548 .1318 .0893 .64 O6 .3407 .1224 .5814 .68 O7 .3317 0 .3018 .66