data_9004757
_chemical_name 'Zippeite'
loop_
_publ_author_name
'Burns P C'
'Deely K M'
'Hayden L A'
_journal_name_full "The Canadian Mineralogist"
_journal_volume 41
_journal_year 2003
_journal_page_first 687
_journal_page_last 706
_publ_section_title
;
 The crystal chemistry of the zippeite group
 Sample: SZIPPNH4II
;
_chemical_formula_sum 'U2 S O10 N2'
_cell_length_a 14.2520
_cell_length_b 8.7748
_cell_length_c 17.1863
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 2149.292
_symmetry_space_group_name_H-M 'C m c a'
loop_
_symmetry_equiv_pos_as_xyz
  'x,y,z'
  '1/2+x,1/2+y,z'
  'x,1/2-y,1/2+z'
  '1/2+x,-y,1/2+z'
  '-x,1/2+y,1/2-z'
  '1/2-x,+y,1/2-z'
  '-x,y,z'
  '1/2-x,1/2+y,z'
  'x,-y,-z'
  '1/2+x,1/2-y,-z'
  'x,1/2+y,1/2-z'
  '1/2+x,+y,1/2-z'
  '-x,1/2-y,1/2+z'
  '1/2-x,-y,1/2+z'
  '-x,-y,-z'
  '1/2-x,1/2-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_Uiso_or_equiv
U(1)   0.23250   0.12680   0.41380   0.01400
S(1)   0.25000   0.38120   0.25000   0.02100
O(1)   0.24340   0.37560   0.45520   0.03700
O(2)   0.30860   0.46960   0.30030   0.03200
O(3)   0.18680   0.28140   0.29930   0.02000
O(4)   0.10700   0.12440   0.43130   0.02900
O(5)   0.35270   0.12860   0.38620   0.03500
NH4(1)   0.00000   0.13500   0.25040   0.09100
NH4(2)   0.00000  -0.16500   0.40300   0.11900