data_global
_chemical_name_mineral 'Helvine'
loop_
_publ_author_name
'Kudoh Y'
'Takeuchi Y'
_journal_name_full 'Zeitschrift fur Kristallographie'
_journal_volume 173 
_journal_year 1985
_journal_page_first 305
_journal_page_last 312
_publ_section_title
;
 The effect of pressure on helvite Mn8S2[Be6Si6O24]
 Sample: P = 14 kbar
;
_database_code_amcsd 0010952
_chemical_compound_source 'Schwarzenberg, Saxony'
_chemical_formula_sum 'Mn4 Be3 Si3 O12 S'
_cell_length_a 8.261
_cell_length_b 8.261
_cell_length_c 8.261
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 563.765
_exptl_crystal_density_diffrn      3.270
_symmetry_space_group_name_H-M 'P -4 3 n'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '-z,x,-y'
  '-y,z,-x'
  '-x,y,-z'
  '1/2+x,1/2-z,1/2-y'
  '1/2+z,1/2-y,1/2-x'
  '1/2+y,1/2-x,1/2-z'
  '1/2+x,1/2+z,1/2+y'
  '1/2+z,1/2+y,1/2+x'
  '1/2+y,1/2+x,1/2+z'
  '-z,-x,y'
  '-y,-z,x'
  '-x,-y,z'
  'z,-x,-y'
  'y,-z,-x'
  'x,-y,-z'
  '1/2-x,1/2+z,1/2-y'
  '1/2-z,1/2+y,1/2-x'
  '1/2-y,1/2+x,1/2-z'
  '1/2-x,1/2-z,1/2+y'
  '1/2-z,1/2-y,1/2+x'
  '1/2-y,1/2-x,1/2+z'
  'z,x,y'
  'y,z,x'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
Mn   0.16800   0.16800   0.16800   0.00038
Be   0.50000   0.00000   0.25000   0.12159
Si   0.00000   0.50000   0.25000   0.00051
O   0.14140   0.14000   0.41510   0.00481
S   0.50000   0.50000   0.50000   0.09182