data_global
_chemical_name_mineral 'Samarskite-(Y)'
loop_
_publ_author_name
'Britvin S N'
'Pekov I V'
'Krzhizhanovskaya M G'
'Agakhanov A A'
'Ternes B'
'Schuller W'
'Chukanov N V'
_journal_name_full 'Physics and Chemistry of Minerals'
_journal_volume 46 
_journal_year 2019
_journal_page_first 727
_journal_page_last 741
_publ_section_title
;
 Redefinition and crystal chemistry of samarskite-(Y), YFe3+Nb2O8:
 cation-ordered niobate structurally related to layered double tungstates
 Sample LS, natural
;
_database_code_amcsd 0021078
_chemical_compound_source 'Laacher See, Eifel, Rhineland-Palatinate, Germany'
_chemical_formula_sum 'Y.25 La.01 Ce.03 Nd.02 Sm.01 Gd.01 Dy.04 Ho.01 Er.02 Yb.03 Th.37 U.13 Ca.03 Fe.73 Mn.18 (Nb1.84 Ti.06 Zr.06 Ta.02 W.02) O8'
_cell_length_a 9.8020
_cell_length_b 5.6248
_cell_length_c 5.2073
_cell_angle_alpha 90
_cell_angle_beta 93.406
_cell_angle_gamma 90
_cell_volume 286.594
_exptl_crystal_density_diffrn      6.185
_symmetry_space_group_name_H-M 'P 1 2/c 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'x,-y,1/2+z'
  '-x,y,1/2-z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
YA   0.00000   0.26303   0.75000   0.25000   0.00623
LaA   0.00000   0.26303   0.75000   0.01000   0.00623
CeA   0.00000   0.26303   0.75000   0.03000   0.00623
NdA   0.00000   0.26303   0.75000   0.02000   0.00623
SmA   0.00000   0.26303   0.75000   0.01000   0.00623
GdA   0.00000   0.26303   0.75000   0.01000   0.00623
DyA   0.00000   0.26303   0.75000   0.04000   0.00623
HoA   0.00000   0.26303   0.75000   0.01000   0.00623
ErA   0.00000   0.26303   0.75000   0.02000   0.00623
YbA   0.00000   0.26303   0.75000   0.03000   0.00623
ThA   0.00000   0.26303   0.75000   0.37000   0.00623
U4+A   0.00000   0.26303   0.75000   0.13000   0.00623
CaA   0.00000   0.26303   0.75000   0.03000   0.00623
Fe3+M   0.50000   0.33655   0.75000   0.73000   0.00650
Mn2+M   0.50000   0.33655   0.75000   0.18000   0.00650
NbB   0.73465   0.18404   0.28544   0.92000   0.00585
TiB   0.73465   0.18404   0.28544   0.03000   0.00585
ZrB   0.73465   0.18404   0.28544   0.03000   0.00585
TaB   0.73465   0.18404   0.28544   0.01000   0.00585
WB   0.73465   0.18404   0.28544   0.01000   0.00585
O1   0.13815   0.06430   0.47640   1.00000   0.01010
O2   0.13102   0.40590   0.09990   1.00000   0.01060
O3   0.63878   0.12070   0.59870   1.00000   0.01060
O4   0.61212   0.37720   0.09880   1.00000   0.01200