Gagarinite-(Y)
Hughes J M, Drexler J W
The Canadian Mineralogist 32 (1994) 563-565
Refinement of the structure of gagarinite-(Y), Nax(CaxREE2-x)F6
_database_code_amcsd 0005407
5.987 5.987 3.5413 90 90 120 P6_3/m
atom     x     y   z  occ  Uiso
Ca     2/3   1/3 .25 .475 .0108
Y      2/3   1/3 .25  .36 .0108
Dy     2/3   1/3 .25  .05 .0108
Gd     2/3   1/3 .25 .045 .0108
Er     2/3   1/3 .25  .02 .0108
Ho     2/3   1/3 .25 .015 .0108
Sm     2/3   1/3 .25 .015 .0108
Yb     2/3   1/3 .25 .005 .0108
Nd     2/3   1/3 .25 .005 .0108
Tb     2/3   1/3 .25 .005 .0108
Ce     2/3   1/3 .25 .005 .0108
Na       0     0   0  .30 .0308
F    .3089 .3933 .25  .90 .0277