Tveitite-(Y)
Bevan D J M, Strahle J, Greis O
Journal of Solid State Chemistry 44 (1982) 75-81
The crystal structure of tveitite, an ordered yttrofluorite mineral
Note: a and b adjusted to match reported bond lengths
_database_code_amcsd 0013486
16.9620 16.9620 9.6664 90 90 120 R-3
atom     x     y     z occ Biso
Y    .0169 .1489 .1786      .60
Ca1      0     0 .5353  .5  2.8
Ca2  .2654 .2348 .1557       .1
Ca3  .1749 .4059 .1672      1.2
F1   .1958 .0831 .0040      1.0
F2   .1102 .0975 .2349      1.4
F3   .0190 .1495 .4146       .1
F4   .2702 .1024 .2573       .3
F5   .1576 .2686 .2515       .2
F6   .0324 .2842 .0971       .4
F7   .2955 .3838 .0744       .3
F8       0     0  .060  .5  1.4