Samarskite-(Y)
Britvin S N, Pekov I V, Krzhizhanovskaya M G, Agakhanov A A, Ternes B, Schuller W, Chukanov N V
Physics and Chemistry of Minerals 46 (2019) 727-741
Redefinition and crystal chemistry of samarskite-(Y), YFe3+Nb2O8:
cation-ordered niobate structurally related to layered double tungstates
Sample BP-1100, originally metamict, after annealing at 1100 C
Locality: Blyumovskaya pit, Ilmeny Mts, South Urals, Russia
_database_code_amcsd 0021080
9.7035 5.6008 5.1637 90 93.285 90 P2/c
atom      x     y     z occ Biso
YA        0 .2686   .75 .61   .3
CeA       0 .2686   .75 .01   .3
NdA       0 .2686   .75 .01   .3
SmA       0 .2686   .75 .02   .3
GdA       0 .2686   .75 .02   .3
DyA       0 .2686   .75 .05   .3
HoA       0 .2686   .75 .02   .3
ErA       0 .2686   .75 .03   .3
TmA       0 .2686   .75 .01   .3
YbA       0 .2686   .75 .03   .3
ThA       0 .2686   .75 .06   .3
Fe3+M    .5 .3311   .75 .88   .8
Mn2+M    .5 .3311   .75 .08   .8
NbB   .7342 .1841 .2853 .82   .3
TaB   .7342 .1841 .2853 .12   .3
TiB   .7342 .1841 .2853 .08   .3
O1     .138  .071  .468       .3
O2     .143  .426  .094       .3
O3     .647  .119  .607       .3
O4     .610  .392  .097       .3