data_global
_chemical_name_mineral 'Nepheline'
loop_
_publ_author_name
'Kahlenberg V'
'Bohm H'
_journal_name_full "American Mineralogist"
_journal_volume 83 
_journal_year 1998
_journal_page_first 631
_journal_page_last 637
_publ_section_title
;
 Crystal structure of hexagonal trinepheline - A new synthetic NaAlSiO4
 modification
;
_chemical_formula_sum 'Si Al Na O4'
_cell_length_a 9.995
_cell_length_b 9.995
_cell_length_c 24.797
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 2145.336
_exptl_crystal_density_diffrn      2.639
_symmetry_space_group_name_H-M 'P 61'
loop_
_symmetry_equiv_pos_as_xyz
  'x,y,z'
  'x-y,x,1/6+z'
  '-y,x-y,1/3+z'
  '-x,-y,1/2+z'
  '-x+y,-x,2/3+z'
  'y,-x+y,5/6+z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Si1   0.20240  -0.69640   0.12790
Si2   0.36370  -0.29770  -0.03740
Si3   0.91220  -0.76360  -0.03500
Si4   0.13340  -0.22180   0.13580
All   0.32660  -0.90200   0.08640
Al2   0.88070  -0.75440   0.09170
Al3   0.81110  -0.29200   0.09540
Al4   0.33080  -0.35480   0.09060
Na1   0.02050  -0.43520   0.03560
Na2   0.47350  -0.55790   0.03030
Na3   0.51830  -0.44260   0.18640
Na4   0.00430  -0.98510   0.02800
O1   0.31370  -0.53710   0.09670
O2   0.05840  -0.66370  -0.07410
O3   0.02810  -0.72710   0.13620
O4   0.27650  -0.68690   0.18690
O5   0.05810  -0.24590   0.19500
O6   0.19180  -0.84130   0.09550
O7   0.68100  -0.46520   0.12640
O8   0.86170  -0.94570  -0.03940
O9   0.96000  -0.70960   0.02710
O10   0.76960  -0.74130  -0.05070
O11   0.17990  -0.35460   0.12620
O12   0.51670  -0.75150   0.09180
O13   0.28810  -0.05330   0.13030
O14   0.30240  -0.32260   0.02390
O15   0.00450  -0.24380   0.09200
O16   0.82120  -0.62340   0.10860
