data_global
_chemical_name_mineral 'Retzian-(Ce)'
loop_
_publ_author_name
'Moore P B'
_journal_name_full 'American Mineralogist'
_journal_volume 52 
_journal_year 1967
_journal_page_first 1603
_journal_page_last 1613
_publ_section_title
;
 Crystal chemistry of the basic manganese arsenate minerals 1. The crystal
 structures of flinkite, Mn2Mn(OH)4(AsO4) and retzian, Mn2Y(OH)4(AsO4)
 Note: Moore did not determine the REE compostion of the sample.
 Subsequent work by Dunn & Sturman (1982) concluded that it is Ce dominant
 Consequently, the REE in this structure has been changed to Ce
;
_database_code_amcsd 0000161
_chemical_formula_sum 'Ce As Mn2 O8 H4'
_cell_length_a 5.67
_cell_length_b 12.03
_cell_length_c 4.863
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 331.706
_exptl_crystal_density_diffrn      4.575
_symmetry_space_group_name_H-M 'P b a n'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,-y,z'
  '1/2-x,y,-z'
  '-x,1/2+y,z'
  'x,1/2-y,-z'
  '1/2+x,1/2+y,-z'
  '1/2-x,1/2-y,z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
Ce   0.25000   0.25000   0.00000   0.00076
As   0.75000   0.25000   0.50000   0.00557
Mn   0.25000   0.55480   0.00000   0.01026
O   0.57690   0.31980   0.30450   0.01381
O-H   0.57830   0.57700   0.20100   0.01368