Fergusonite-(Y)
Komkov A I
Soviet Physics Crystallography 4 (1959) 796-800
The structure of natural fergusonite, and of a polymorphic modification
Locality: Ural Mountains, Russia
Sample: annealed at T = 1000 C for t = 15 min
_database_code_amcsd 0015539
5.05 10.89 5.27 90 94.50 90 I2
atom     x    y    z occ
Y1       0 .476    0 .85
Yb1      0 .476    0 .15
Y2       0 .238   .5 .85
Yb2      0 .238   .5 .15
Nb1      0    0    0
Nb2      0 .714   .5
O1   -.185  .08  .25
O2    -.25  .83 .315
O3   -.185  .65  .75
O4    -.25  .90 .815