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 = 133 K
Note: z(F6) corrected
_database_code_amcsd 0013484
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  .2536     0 .4958  .0121  .0122  .0432      0 -.0033      0
Na2      0   .25   .75  .0142  .0253  .0123      0      0  .0070
Mg   .2520     0 .9992  .0052  .0047  .0078      0  .0005      0
Al   .0014   .25   .25  .0053  .0052  .0078      0      0 -.0012
F1   .0013     0 .8862  .0054  .0140  .0118      0  .0013      0
F3   .0023 .1644 .4713  .0127  .0111  .0100 -.0012 -.0010  .0000
F5   .1875 .1382 .1822  .0087  .0088  .0134  .0002 -.0001 -.0030
F6   .3185 .1367 .8209  .0095  .0095  .0154  .0041   .003 -.0045