data_global
_chemical_name_mineral 'Yurmarinite'
loop_
_publ_author_name
'Masquelier C'
'd'Yvoire F'
'Collin G'
_journal_name_full 'Journal of Solid State Chemistry'
_journal_volume 118 
_journal_year 1995
_journal_page_first 33
_journal_page_last 42
_publ_section_title
;
 Crystal structure of Na7Fe4(AsO4)6 and alpha-Na3Al2(AsO4)3,
 two sodium ion conductors structurally related to II-Na3Fe2(AsO4)3
;
_database_code_amcsd 0019957
_chemical_compound_source 'Synthetic'
_chemical_formula_sum 'Na6.88 Fe4 As6 O24'
_cell_length_a 13.807
_cell_length_b 13.807
_cell_length_c 18.354
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 3030.121
_exptl_crystal_density_diffrn      3.995
_symmetry_space_group_name_H-M 'R -3 c'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '2/3+x,1/3+y,1/3+z'
  '1/3+x,2/3+y,2/3+z'
  'x,x-y,1/2+z'
  '2/3+x,1/3+x-y,5/6+z'
  '1/3+x,2/3+x-y,1/6+z'
  'y,x,1/2-z'
  '2/3+y,1/3+x,5/6-z'
  '1/3+y,2/3+x,1/6-z'
  '-x+y,y,1/2+z'
  '2/3-x+y,1/3+y,5/6+z'
  '1/3-x+y,2/3+y,1/6+z'
  '-x,-x+y,1/2-z'
  '2/3-x,1/3-x+y,5/6-z'
  '1/3-x,2/3-x+y,1/6-z'
  '-y,-x,1/2+z'
  '2/3-y,1/3-x,5/6+z'
  '1/3-y,2/3-x,1/6+z'
  'x-y,-y,1/2-z'
  '2/3+x-y,1/3-y,5/6-z'
  '1/3+x-y,2/3-y,1/6-z'
  'y,-x+y,-z'
  '2/3+y,1/3-x+y,1/3-z'
  '1/3+y,2/3-x+y,2/3-z'
  '-x+y,-x,z'
  '2/3-x+y,1/3-x,1/3+z'
  '1/3-x+y,2/3-x,2/3+z'
  '-x,-y,-z'
  '2/3-x,1/3-y,1/3-z'
  '1/3-x,2/3-y,2/3-z'
  '-y,x-y,z'
  '2/3-y,1/3+x-y,1/3+z'
  '1/3-y,2/3+x-y,2/3+z'
  'x-y,x,-z'
  '2/3+x-y,1/3+x,1/3-z'
  '1/3+x-y,2/3+x,2/3-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
Na1   0.00000   0.00000   0.00000   1.00000   0.01659
Na2   0.79150   0.01660   0.05370   0.98000   0.02204
Fe1   0.00000   0.00000   0.25000   1.00000   0.00747
Fe2   0.78040   0.00000   0.25000   1.00000   0.00595
As   0.18456   0.98870   0.14550   1.00000   0.00709
O1   0.52790   0.06200   0.14720   1.00000   0.01229
O2   0.71300   0.05450   0.17810   1.00000   0.01267
O3   0.59240   0.18740   0.02100   1.00000   0.01115
O4   0.02510   0.16440   0.06080   1.00000   0.01444