data_global
_chemical_name_mineral 'Aegirine'
loop_
_publ_author_name
'Ballet O'
'Coey J M D'
'Fillion G'
'Ghose A'
'Hewat A W'
'Regnard J R'
_journal_name_full 'Physics and Chemistry of Minerals'
_journal_volume 16 
_journal_year 1989
_journal_page_first 672
_journal_page_last 677
_publ_section_title
;
 Magnetic order in acmite; NaFeSi2O6
 Sample: T = 14 K
;
_database_code_amcsd 0007464
_chemical_formula_sum 'Fe.992 Na.978 Si1.96 O6'
_cell_length_a 9.68
_cell_length_b 8.83
_cell_length_c 5.30
_cell_angle_alpha 90
_cell_angle_beta 107.3
_cell_angle_gamma 90
_cell_volume 432.520
_exptl_crystal_density_diffrn      3.516
_symmetry_space_group_name_H-M 'C 1 2/c 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,z'
  'x,-y,1/2+z'
  '1/2+x,1/2-y,1/2+z'
  '-x,y,1/2-z'
  '1/2-x,1/2+y,1/2-z'
  '-x,-y,-z'
  '1/2-x,1/2-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
FeM1   0.00000   0.89910   0.25000   0.99200
NaM2   0.00000   0.29710   0.25000   0.97800
Si   0.28900   0.09180   0.23770   0.98000
O1   0.11410   0.07910   0.13870   1.00000
O2   0.35920   0.25590   0.30100   1.00000
O3   0.35400   0.00720   0.01130   1.00000