Cordierite
Wallace J H, Wenk H R
American Mineralogist 65 (1980) 96-111
Structure variation in low cordierites
Note: sample sci 624
Locality: Debris SW Cap Brasca, Bergell Alps, Switzerland
_database_code_amcsd 0000766
17.088 9.726 9.335 90 90 90 Cccm
atom       x       y      z  occ B(1,1) B(2,2) B(3,3)  B(1,2)  B(1,3)  B(2,3)
Mg1   .33751       0    .25 .816 .00032 .00109 .00174       0       0 0.00008
Fe1   .33751       0    .25 .130 .00032 .00109 .00174       0       0 0.00008
Al1      .25     .25 .25006 .964 .00041 .00097 .00111 0.00013       0       0
Si2        0      .5    .25 .853 .00020 .00091 .00075       0       0       0
Al2        0      .5    .25 .095 .00020 .00091 .00075       0       0       0
Si3   .19234 .077810      0 .970 .00030 .00072 .00101 0.00008       0       0
Si4   .13511 -.23714      0 .971 .00025 .00090 .00104 -.00009       0       0
Al5   .05059 .307700      0 .928 .00029 .00109 .00115 0.00006       0       0
Si5   .05059 .307700      0 .049 .00029 .00109 .00115 0.00006       0       0
O1    .24695 -.10288 .35874      .00074 .00167 .00159 -.00018  .00045 -.00027
O2    .06208 -.41554 .34870      .00049 .00215 .00179 -.00013 -.00003 -.00088
O3   -.17323 -.30982 .35824      .00059 .00200 .00185 0.00015 -.00023 -.00053
O4    .04334 -.24887      0      .00035 .00332 .00351 -.00027       0       0
O5    .12219 .184810      0      .00065 .00219 .00383 0.00058       0       0
O6    .16431 -.07930      0      .00089 .00118 .00388 -.00037       0       0
OH1        0       0    .25 .960   .220   .018   .075       0       0       0
OH2        0       0      0 .260   .015   .022   .057   0.001       0       0