data_global
_chemical_name_mineral 'Nepheline'
loop_
_publ_author_name
'Hassan I'
'Antao S M'
'Hersi A A M'
_journal_name_full 'The Canadian Mineralogist'
_journal_volume 41 
_journal_year 2003
_journal_page_first 759
_journal_page_last 783
_publ_section_title
;
 Single-crystal XRD, TEM, and thermal studies of the satellite
 reflection in nepheline
;
_database_code_amcsd 0005859
_chemical_formula_sum 'K.675 Na3 Al4 Si4 O16'
_cell_length_a 9.9853
_cell_length_b 9.9853
_cell_length_c 8.3689
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 722.639
_exptl_crystal_density_diffrn      2.627
_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
K   0.00000   0.00000   0.99200   0.67500   0.02600
Na   0.44290   0.99700   0.99520   1.00000   0.02300
Al1   0.66667   0.33333   0.19070   1.00000   0.01100
Si2   0.66667   0.33333   0.80240   1.00000   0.01300
Si3   0.33390   0.09390   0.31030   1.00000   0.01200
Al4   0.33210   0.09310   0.68380   1.00000   0.01100
O1   0.71130   0.34700   0.98500   0.33333   0.03000
O2   0.31740   0.02720   0.49110   1.00000   0.02900
O3   0.52380   0.17310   0.73480   1.00000   0.03400
O4   0.50950   0.16210   0.24870   1.00000   0.03100
O5   0.28570   0.22710   0.31130   1.00000   0.02000
O6   0.26790   0.22390   0.68810   1.00000   0.02200
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
K 0.02200 0.02200 0.03400 0.01100 0.00000 0.00000
Na 0.02000 0.02900 0.01800 0.01200 -0.00200 0.00100
Al1 0.01200 0.01200 0.01000 0.00600 0.00000 0.00000
Si2 0.01300 0.01300 0.01200 0.00700 0.00000 0.00000
Si3 0.01300 0.01000 0.01400 0.00500 0.00000 0.00000
Al4 0.01100 0.00900 0.01300 0.00500 0.00100 0.00000
O1 0.02900 0.04600 0.00300 0.00800 0.00600 -0.00700
O2 0.05600 0.02800 0.01400 0.02900 0.00100 0.00100
O3 0.01200 0.01200 0.07500 0.00500 -0.00500 -0.00100
O4 0.01100 0.01300 0.06600 0.00400 0.00500 0.00200
O5 0.02500 0.01800 0.01800 0.01300 0.00400 0.00500
O6 0.02900 0.01800 0.02300 0.01600 -0.00200 -0.00300