data_global
_chemical_name_mineral 'Nepheline'
loop_
_publ_author_name
'Buerger M J'
'Klein G E'
'Hamburger G E'
_journal_name_full 'American Mineralogist'
_journal_volume 32
_journal_year 1947
_journal_page_first 197
_journal_page_last 197
_publ_section_title
;
 The structure of nepheline
;
_database_code_amcsd 40
_chemical_formula_sum 'K Na3 Si4 Al4 O16'
_cell_length_a 10.05
_cell_length_b 10.05
_cell_length_c 8.38
_cell_angle_alpha 90.0
_cell_angle_beta 90.0
_cell_angle_gamma 120.0
_cell_volume 733.005
_exptl_crystal_density_diffrn  2.647
_symmetry_space_group_name_H-M 'P 63'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'x-y,x,1/2+z'
  '-y,x-y,z'
  '-x,-y,1/2+z'
  '-x+y,-x,z'
  'y,-x+y,1/2+z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
K   0.0  0.0  0.0
Na   0.01  0.43  0.0
Si1   0.333333  0.666667  0.82
Al1   0.333333  0.666667  0.18
Si2   0.09  0.33  0.333333
Al2   0.09  0.33  0.666667
O1   0.333333  0.666667  0.0
O2   0.09  0.33  0.5
O3   0.17  0.52  0.75
O4   0.17  0.52  0.25
O5   0.25  0.28  0.25
O6   0.25  0.28  0.75