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 LS, natural Locality: Laacher See, Eifel, Rhineland-Palatinate, Germany _database_code_amcsd 0021078 9.8020 5.6248 5.2073 90 93.406 90 P2/c atom x y z occ Uiso YA 0 .26303 .75 .25 .00623 LaA 0 .26303 .75 .01 .00623 CeA 0 .26303 .75 .03 .00623 NdA 0 .26303 .75 .02 .00623 SmA 0 .26303 .75 .01 .00623 GdA 0 .26303 .75 .01 .00623 DyA 0 .26303 .75 .04 .00623 HoA 0 .26303 .75 .01 .00623 ErA 0 .26303 .75 .02 .00623 YbA 0 .26303 .75 .03 .00623 ThA 0 .26303 .75 .37 .00623 U4+A 0 .26303 .75 .13 .00623 CaA 0 .26303 .75 .03 .00623 Fe3+M .5 .33655 .75 .73 .0065 Mn2+M .5 .33655 .75 .18 .0065 NbB .73465 .18404 .28544 .92 .00585 TiB .73465 .18404 .28544 .03 .00585 ZrB .73465 .18404 .28544 .03 .00585 TaB .73465 .18404 .28544 .01 .00585 WB .73465 .18404 .28544 .01 .00585 O1 .13815 .0643 .4764 .0101 O2 .13102 .4059 .0999 .0106 O3 .63878 .1207 .5987 .0106 O4 .61212 .3772 .0988 .0120