data_global
_chemical_name_mineral 'Gagarinite-(Y)'
loop_
_publ_author_name
'Hughes J M'
'Drexler J W'
_journal_name_full 'The Canadian Mineralogist'
_journal_volume 32 
_journal_year 1994
_journal_page_first 563
_journal_page_last 565
_publ_section_title
;
 Refinement of the structure of gagarinite-(Y), Nax(CaxREE2-x)F6
;
_database_code_amcsd 0005407
_chemical_formula_sum '(Ca.475 Y.36 Dy.05 Gd.045 Er.02 Ho.015 Sm.015 Yb.005 Nd.005 Tb.005 Ce.005) Na.3 F2.7'
_cell_length_a 5.987
_cell_length_b 5.987
_cell_length_c 3.5413
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 109.929
_exptl_crystal_density_diffrn      4.096
_symmetry_space_group_name_H-M 'P 63/m'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '-x+y,-x,1/2-z'
  'x-y,x,1/2+z'
  'y,-x+y,-z'
  '-y,x-y,z'
  'x,y,1/2-z'
  '-x,-y,1/2+z'
  'x-y,x,-z'
  '-x+y,-x,z'
  '-y,x-y,1/2-z'
  'y,-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
Ca   0.66667   0.33333   0.25000   0.47500   0.01080
Y   0.66667   0.33333   0.25000   0.36000   0.01080
Dy   0.66667   0.33333   0.25000   0.05000   0.01080
Gd   0.66667   0.33333   0.25000   0.04500   0.01080
Er   0.66667   0.33333   0.25000   0.02000   0.01080
Ho   0.66667   0.33333   0.25000   0.01500   0.01080
Sm   0.66667   0.33333   0.25000   0.01500   0.01080
Yb   0.66667   0.33333   0.25000   0.00500   0.01080
Nd   0.66667   0.33333   0.25000   0.00500   0.01080
Tb   0.66667   0.33333   0.25000   0.00500   0.01080
Ce   0.66667   0.33333   0.25000   0.00500   0.01080
Na   0.00000   0.00000   0.00000   0.30000   0.03080
F   0.30890   0.39330   0.25000   0.90000   0.02770