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 = ambient
Note: y(F6) and z(F6) corrected
_database_code_amcsd 0013481
7.051 9.968 7.285 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 .0003    .5  .0177  .0192  .0553      0 -.0045      0
Na2  -.0027   .25   .75  .0219  .0333  .0149      0      0  .0095
Mg      .25 .0006     0  .0074  .0063  .0071      0 -.0008      0
Al    .0000   .25   .25  .0078  .0070  .0075      0      0 -.0018
F1        0     0 .8863  .0078  .0191  .0127 -.0029      0      0
F3   -.0016 .1648 .4709  .0184  .0159  .0095  .0035  .0004  .0014
F5    .1830 .1359 .1818  .0145  .0128  .0180  .0098  .0009 -.0061
F6    .3150 .6388 .6791  .0115  .0135  .0155 -.0032  .0025 -.0083