data_global
_chemical_name_mineral 'Osumilite'
loop_
_publ_author_name
'Winter W'
'Armbruster T'
'Lengauer C'
_journal_name_full 'European Journal of Mineralogy'
_journal_volume 7 
_journal_year 1995
_journal_page_first 277
_journal_page_last 286
_publ_section_title
;
 Crystal structure refinement of synthetic osumilite-type
 phases: BaMg2Al6Si9O30, SrMg2Al6Si9O30 and Mg2Al4Si11O30
 Sample: MAS, Mg2Al4Si11O30
;
_database_code_amcsd 0006584
_chemical_formula_sum 'Ba.09 Mg2 Si10.8 Al4.2 O30'
_cell_length_a 10.058
_cell_length_b 10.058
_cell_length_c 14.336
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 1255.977
_exptl_crystal_density_diffrn      2.532
_symmetry_space_group_name_H-M 'P 6/m c c'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '-x,-x+y,1/2+z'
  'x,x-y,1/2-z'
  '-x+y,-x,-z'
  'x-y,x,z'
  '-y,-x,1/2+z'
  'y,x,1/2-z'
  'y,-x+y,-z'
  '-y,x-y,z'
  'x-y,-y,1/2+z'
  '-x+y,y,1/2-z'
  'x,y,-z'
  '-x,-y,z'
  'x,x-y,1/2+z'
  '-x,-x+y,1/2-z'
  'x-y,x,-z'
  '-x+y,-x,z'
  'y,x,1/2+z'
  '-y,-x,1/2-z'
  '-y,x-y,-z'
  'y,-x+y,z'
  '-x+y,y,1/2+z'
  'x-y,-y,1/2-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
BaC   0.00000   0.00000   0.25000   0.09000   0.02533
MgA   0.33333   0.66667   0.25000   1.00000   0.02533
SiT1   0.10460   0.35330   0.10540   0.90000   0.02533
AlT1   0.10460   0.35330   0.10540   0.10000   0.02533
AlT2   0.50000   0.50000   0.25000   1.00000   0.02533
O1   0.12890   0.41340   0.00000   1.00000   0.02533
O2   0.22200   0.29360   0.12930   1.00000   0.02533
O3   0.14680   0.49800   0.17990   1.00000   0.02533