Weberite
Knop O, Cameron T S, Jochem K
Journal of Solid State Chemistry 43 (1982) 213-221
What is the true space group of weberite?
Locality: Ivigtut, Greenland
Sample: I2_12_12_1 refinement, T = 133 K
Note: y(F6) and z(F6) corrected
_database_code_amcsd 0013482
7.050 9.979 7.297 90 90 90 *I2_12_12_1
0 .25 .5
atom      x     y     z U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3)
Na1     .25 .0001    .5  .0119  .0122  .0440      0 -.0029      0
Na2  -.0004   .25   .75  .0148  .0251  .0120      0      0  .0069
Mg      .25 .0003     0  .0048  .0048  .0076      0  .0005      0
Al   -.0011   .25   .25  .0056  .0050  .0076      0      0 -.0010
F1        0     0 .8861  .0062  .0143  .0116      0      0      0
F3   -.0001 .1644 .4713  .0123  .0109  .0102      0 -.0020  .0003
F5    .1838 .1362 .1818  .0083  .0104  .0166 -.0012 -.0001 -.0033
F6    .3148 .6385 .6791  .0103  .0085  .0118  .0053  .0032 -.0038