data_9000126
_chemical_name 'Abernathyite'
loop_
_publ_author_name
'Ross M'
'Evans H T'
_journal_name_full "American Mineralogist"
_journal_volume 49
_journal_year 1964
_journal_page_first 1578
_journal_page_last 1602
_publ_section_title
;
 Studies of the torbernite minerals (I): The crystal structure of abernathyite
 and the structurally related compounds NH4(UO2AsO4).3H2O and K(H3O)(UO2AsO4)2.6
;
_chemical_formula_sum 'As U O9 K H4'
_cell_length_a 7.176
_cell_length_b 7.176
_cell_length_c 18.126
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 933.398
_symmetry_space_group_name_H-M 'P 4/n c c'
loop_
_symmetry_equiv_pos_as_xyz
  'x,y,z'
  '1/2-y,1/2-x,1/2+z'
  '1/2+y,1/2+x,1/2-z'
  '1/2+y,-x,-z'
  '1/2-y,x,z'
  'x,1/2-y,1/2+z'
  '-x,1/2+y,1/2-z'
  '1/2+x,1/2+y,-z'
  '1/2-x,1/2-y,z'
  'y,x,1/2+z'
  '-y,-x,1/2-z'
  '-y,1/2+x,-z'
  'y,1/2-x,z'
  '1/2-x,y,1/2+z'
  '1/2+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_Uiso_or_equiv
As   0.75000   0.25000   0.00000   1.00000   0.02330
U   0.25000   0.25000   0.05140   1.00000   0.02406
Oa   0.25000   0.25000   0.15150   1.00000   0.03787
Ob   0.25000   0.25000   0.95750   1.00000   0.03141
Oc   0.69630   0.07290   0.44330   1.00000   0.03483
O-Hd   0.16500   0.98760   0.31540   0.75000   0.04699
K   0.16500   0.98760   0.31540   0.25000   0.04699