data_global
_chemical_name_mineral 'Mullite-Ge'
loop_
_publ_author_name
'Saalfeld H'
'Gerlach H'
_journal_name_full 'Zeitschrift fur Kristallographie'
_journal_volume 195 
_journal_year 1991
_journal_page_first 65
_journal_page_last 73
_publ_section_title
;
 Solid solution and optical properties of (Al,Ge)-mullites
;
_database_code_amcsd 0011005
_chemical_compound_source 'Synthetic'
_chemical_formula_sum 'Al2.383 Ge.617 O4.809'
_cell_length_a 7.644
_cell_length_b 7.760
_cell_length_c 2.923
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 173.385
_exptl_crystal_density_diffrn      3.564
_symmetry_space_group_name_H-M 'P b a m'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2-y,z'
  '1/2-x,1/2+y,-z'
  '1/2-x,1/2+y,z'
  '1/2+x,1/2-y,-z'
  'x,y,-z'
  '-x,-y,z'
  '-x,-y,-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
Al1   0.00000   0.00000   0.00000   1.00000   0.00671
Al2   0.34990   0.16060   0.50000   0.50000   0.00608
Ge2   0.34990   0.16060   0.50000   0.30860   0.00608
Al3   0.23080   0.29660   0.50000   0.19140   0.01115
O1   0.37080   0.28750   0.00000   1.00000   0.01343
O2   0.13690   0.07990   0.50000   1.00000   0.01241
O3   0.00000   0.50000   0.50000   0.42600   0.01305
O4   0.04370   0.45470   0.50000   0.19140   0.01292