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: I2mb refinement, T = ambient
Note: z(F6) corrected
_database_code_amcsd 0013483
7.051 9.968 7.285 90 90 90 *I2mb
0 .25 .25
atom     x     y     z U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3)
Na1  .2544     0 .4954  .0180  .0191  .0539      0 -.0045      0
Na2      0   .25   .75  .0213  .0335  .0146      0      0  .0095
Mg   .2522     0 .9990  .0073  .0059  .0068      0  .0008      0
Al   .0025   .25   .25  .0076  .0067  .0071      0      0 -.0018
F1   .0043     0 .8864  .0077  .0187  .0126      0  .0015      0
F3   .0042 .1649 .4709  .0180  .0156  .0094 -.0011 -.0009  .0014
F5   .1874 .1376 .1813  .0143  .0135  .0154  .0018  .0021 -.0064
F6   .3192 .1372 .8206  .0108  .0117  .0178  .0048  .0012 -.0051