data_global
_amcsd_formula_title 'Na.7K.3GaSiO4'
loop_
_publ_author_name
'Barbier J'
'Liu B'
'Weber J'
_journal_name_full 'European Journal of Mineralogy'
_journal_volume 5 
_journal_year 1993
_journal_page_first 297
_journal_page_last 305
_publ_section_title
;
 Crystal chemistry of the (Na,K)GaSiO4 system
 Note: kalsilite structure
;
_database_code_amcsd 0006479
_chemical_formula_sum 'Na2.1 K.9 (Ga3 Si3) O12'
_cell_length_a 8.8169
_cell_length_b 8.8169
_cell_length_c 8.3873
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 564.657
_exptl_crystal_density_diffrn      3.346
_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
NaM1   0.00000   0.00000   0.75000   0.30000   0.03420
KM1   0.00000   0.00000   0.75000   0.70000   0.03420
NaM2   0.66667   0.33333   0.79100   1.00000   0.05953
NaM3   0.33333   0.66667   0.72800   0.80000   0.03546
KM3   0.33333   0.66667   0.72800   0.20000   0.03546
GaT1   0.68300   0.65700   0.54700   0.95000   0.03673
SiT1   0.68300   0.65700   0.54700   0.05000   0.03673
GaT2   0.65500  -0.02200   0.43400   0.05000   0.03673
SiT2   0.65500  -0.02200   0.43400   0.95000   0.03673
O1   0.74400   0.87800   0.52500   1.00000   0.04053
O2   0.47100   0.91800   0.52400   1.00000   0.04053
O3   0.77700   0.19000   0.43300   1.00000   0.04053
O4   0.72700   0.63600   0.74400   1.00000   0.06713