data_global
_amcsd_formula_title '(Na.75K.25)AlGeO4'
loop_
_publ_author_name
'Hammond R P'
'Barbier J'
_journal_name_full 'Acta Crystallographica, Section B'
_journal_volume 54 
_journal_year 1998
_journal_page_first 211
_journal_page_last 220
_publ_section_title
;
 Monoclinic and hexagonal nepheline structures of (Na3/4K1/4)AlGeO4
 Note: hexagonal nepheline
;
_database_code_amcsd 0009903
_chemical_compound_source 'Synthetic'
_chemical_formula_sum 'Na3.12 K.76 Al3.88 Ge4.12 O16'
_cell_length_a 10.1640
_cell_length_b 10.1640
_cell_length_c 8.540
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 764.043
_exptl_crystal_density_diffrn      3.309
_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
_atom_site_occupancy
_atom_site_U_iso_or_equiv
Na1   0.00000   0.00000   0.99750   0.12000   0.04360
KK1   0.00000   0.00000   0.99750   0.76000   0.04360
Na2   0.99450   0.43800   0.99640   1.00000   0.03000
Al1   0.33333   0.66667   0.18660   0.97000   0.01150
Gel   0.33333   0.66667   0.18660   0.03000   0.01150
Al2   0.08970   0.33250   0.68100   0.97000   0.01300
Ge2   0.08970   0.33250   0.68100   0.03000   0.01300
Ge3   0.33333   0.66667   0.80000   1.00000   0.01760
Ge4   0.08990   0.33360   0.30804   1.00000   0.01645
O1   0.26640   0.61240   0.99480   0.33333   0.02700
O2   0.01580   0.31470   0.49530   1.00000   0.04340
O3   0.16430   0.51860   0.74010   1.00000   0.05600
O4   0.16390   0.51810   0.25100   1.00000   0.05200
O5   0.22320   0.27510   0.31410   1.00000   0.02530
O6   0.22540   0.27620   0.67560   1.00000   0.02390