data_global
_chemical_name_mineral 'Norbergite'
loop_
_publ_author_name
'Taylor W'
'West J'
_journal_name_full 'Zeitschrift fur Kristallographie'
_journal_volume 70 
_journal_year 1929
_journal_page_first 461
_journal_page_last 474
_publ_section_title
;
 The Structure of Norbergite
 _cod_database_code 1011009
;
_database_code_amcsd 0017920
_chemical_formula_sum 'O5 F Mg3 Si'
_cell_length_a 4.7
_cell_length_b 10.2
_cell_length_c 8.72
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 418.037
_exptl_crystal_density_diffrn      3.178
_symmetry_space_group_name_H-M 'P b n m'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'x,y,1/2-z'
  '-x,-y,1/2+z'
  '1/2+x,1/2-y,1/2+z'
  '1/2-x,1/2+y,1/2-z'
  '1/2-x,1/2+y,z'
  '1/2+x,1/2-y,-z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
O1   0.25000   0.29200   0.08300   1.00000
O2   0.25000   0.04200   0.25000   1.00000
O3  -0.25000   0.20800   0.25000   1.00000
F1  -0.25000  -0.04200   0.08300   0.50000
O4  -0.25000  -0.04200   0.08300   0.50000
Mg1   0.00000  -0.36100   0.07800   1.00000
Mg2   0.01400  -0.11100   0.25000   1.00000
Si1   0.38900  -0.27800   0.25000   1.00000