data_global
_chemical_name_mineral 'Aegirine'
loop_
_publ_author_name
'Redhammer G J'
'Amthauer G'
'Lottermoser W'
'Treutmann W'
_journal_name_full 'European Journal of Mineralogy'
_journal_volume 12 
_journal_year 2000
_journal_page_first 105
_journal_page_last 120
_publ_section_title
;
 Synthesis and structural properties of clinopyroxenes of the
 hedenbergite CaFeSi2O6 - aegirine NaFeSi2O6 solid-solution series
 Sample: ae100/12
;
_database_code_amcsd 0006824
_chemical_formula_sum 'Na Fe Si2 O6'
_cell_length_a 9.6549
_cell_length_b 8.7947
_cell_length_c 5.2938
_cell_angle_alpha 90
_cell_angle_beta 107.394
_cell_angle_gamma 90
_cell_volume 428.952
_exptl_crystal_density_diffrn      3.577
_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_U_iso_or_equiv
NaM2   0.00000   0.30030   0.25000   0.01583
FeM1   0.00000   0.89870   0.25000   0.00659
SiT   0.29050   0.08870   0.23440   0.00367
O1   0.11410   0.07720   0.13740   0.00975
O2   0.35860   0.25500   0.29900   0.01026
O3   0.34940   0.00950   0.01110   0.00659