Weeksite
Fejfarova K, Plasil J, Yang H, Cejka J, Dusek M, Downs R T, Barkley M C, Skoda R
American Mineralogist 97 (2012) 750-754
Revision of the crystal structure and chemical formula of weeksite,
K2(UO2)2(Si5O13)*4H2O
Locality: Anderson mine, Arizona, USA
_database_code_amcsd 0018760
14.1957 14.2291 9.6305 90 111.578 90 C2/m
atom        x       y      z  occ   Uiso U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3)
U1    .099331 .246786 .89678      .01189 .00807 .01867 .00959 .00057 .00403 .00072
K1     -.0707       0  .8602 .951  .0369  .0280  .0310   .057      0  .0224      0
K2      .2460       0  .8433 .930   .054   .058   .040   .089      0   .055      0
Si1         0   .3068     .5       .0166  .0133  .0244  .0121      0  .0046      0
Si2    .18748  .24984  .2495       .0116  .0094  .0180  .0080  .0011  .0038 -.0010
Si3    .29855  .10998  .5004       .0184  .0220  .0156  .0192 -.0011  .0095  .0000
O1      .4105   .1224  .4996        .033   .020   .030   .052  -.005   .018  -.002
O2      .0712   .2440  .1370        .023   .006   .055   .007   .000   .001  -.001
O3      .2472   .2551  .1367        .024   .009   .055   .009   .000   .005  -.001
O4      .0366   .2437  .6473        .023   .024   .037   .008   .003   .006   .006
O5      .2162   .1560  .3546        .027   .028   .026   .021  -.001   .002   .011
O6      .2705       0  .4998        .022   .029   .012   .029      0   .013      0
O7      .2892   .1573  .6467        .026   .036   .018   .027  -.003   .016  -.007
O8      .1020   .1201  .9055        .029   .035   .019   .040  -.001   .021   .001
O9      .0990   .3727  .8972        .032   .036   .020   .042  -.003   .016  -.003
Wat10   .4310       0  .8411        .053   .033   .040   .073      0   .005      0
Wat11  -.2624       0  .8441  .98   .059   .059   .052   .073      0   .034      0
Wat12       0       0     .5  .72   .036
Wat13       0   -.079     .5 .259   .036
Wat14  -.0464  -.0614   .602 .281   .036
Wat15  -.0917  -.0636   .398 .264   .036
Wat16   -.445       0   .702  .24   .024