data_global
_chemical_name_mineral 'Nepheline'
loop_
_publ_author_name
'Antao S M'
'Hassan I'
_journal_name_full 'The Canadian Mineralogist'
_journal_volume 48 
_journal_year 2010
_journal_page_first 69
_journal_page_last 80
_publ_section_title
;
 Nepheline: structure of three samples from the Bancroft area, Ontario,
 obtained using synchrotron high-resolution powder x-ray diffraction
 Sample: 2
;
_database_code_amcsd 0006319
_chemical_compound_source 'Nephton, Bancroft area, Ontario, Canada'
_chemical_formula_sum 'K.92 Na3 Al4 Si4 O16'
_cell_length_a 10.00215
_cell_length_b 10.00215
_cell_length_c 8.38742
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 726.684
_exptl_crystal_density_diffrn      2.656
_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
K1   0.00000   0.00000   0.99500   0.92000   0.02020
Na1   0.44424   0.99778   0.00190   1.00000   0.02620
Al1   0.66667   0.33333   0.18750   1.00000   0.01000
Al2   0.33320   0.09380   0.68420   1.00000   0.00938
Si1   0.66667   0.33333   0.79840   1.00000   0.01000
Si2   0.33370   0.09270   0.31040   1.00000   0.00938
O1   0.70730   0.33710   0.98740   0.33333   0.02800
O2   0.31590   0.02610   0.49950   1.00000   0.02450
O3   0.52360   0.17590   0.72230   1.00000   0.03130
O4   0.51120   0.16270   0.23900   1.00000   0.02250
O5   0.28610   0.22350   0.31400   1.00000   0.01360
O6   0.26510   0.22350   0.69380   1.00000   0.01590