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 a pelitic schist, south-central Maine, USA (Ferry)
_database_code_amcsd 0001019
17.056 9.783 9.335 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   .24549 -.10446 .35842      .0121  .0083  .0073 -.0006  .0029 -.0006
O16   .06140 -.41540 .34868      .0078  .0120  .0081 -.0019  .0002 -.0036
O13  -.17273 -.30701 .35842      .0096  .0107  .0071  .0025 -.0018 -.0019
O26   .04256 -.24250      0      .0059  .0161  .0189 -.0013      0      0
O21   .11916  .18157      0      .0138  .0121  .0179  .0065      0      0
O23   .16287 -.07747      0      .0147  .0075  .0188 -.0037      0      0
Al11     .25     .25 .25018 .92  .0087  .0078  .0053  .0007      0      0
Be11     .25     .25 .25018 .08  .0087  .0078  .0053  .0007      0      0
Si16       0      .5    .25      .0066  .0073  .0047      0      0      0
Si21  .19140  .07894      0      .0054  .0048  .0056  .0003      0      0
Si23 -.13524  .23542      0      .0049  .0057  .0054 -.0011      0      0
Al26  .05052  .30935      0      .0048  .0063  .0055  .0006      0      0
Mg    .33680       0    .25 .53  .0059  .0069  .0087  .0002      0      0
Fe    .33680       0    .25 .29  .0059  .0069  .0087  .0002      0      0
Li    .33680       0    .25 .18  .0059  .0069  .0087  .0002      0      0
NaCh0      0       0      0 .36   .024   .016   .041  .0020      0      0
OHCh1      0       0    .25 .85   .123   .059   .035      0      0      0