Ekanite
Szymanski J T, Owens D R, Roberts A C, Ansell H G, Chao G Y
The Canadian Mineralogist 20 (1982) 65-75
A mineralogical study and crystal-structure determination of
nonmetamict ekanite, ThCa2Si8O20
Note: Changed O2-x coordinate to match reported bond lengths
_database_code_amcsd 0005184
7.483 7.483 14.893 90 90 90 I422
atom     x     y     z occ U(1,1) U(2,2) U(3,3) U(1,2) U(1,3) U(2,3)
Th       0     0     0 .95  .0103  .0103  .0143      0      0      0
U        0     0     0 .05  .0103  .0103  .0143      0      0      0
Ca      .5     0     0 .96  .0158  .0293  .0267      0      0      0
Fe      .5     0     0 .03  .0158  .0293  .0267      0      0      0
Mn      .5     0     0 .01  .0158  .0293  .0267      0      0      0
Si   .3335 .2540 .1479      .0160  .0147  .0220 -.0005 -.0007 -.0015
O1   .2544 .4521 .1251      .0262  .0126  .0523  .0025 -.0013  .0028
O2   .2124 .7124   .25      .0606  .0606  .0207  .0127  .0069  .0069
O3   .2553 .1075 .0818      .0230  .0279  .0291 -.0025 -.0070 -.0081