data_global
_chemical_name_mineral 'Welinite'
loop_
_publ_author_name
'Moore P B'
_journal_name_full 'Arkiv for Mineralogi och Geologi'
_journal_volume 4 
_journal_year 1969
_journal_page_first 459
_journal_page_last 466
_publ_section_title
;
 The crystal structure of welinite (Mn+4,W)<1(Mn+2,W,Mg)<3Si(O,OH)7
;
_database_code_amcsd 0012047
_chemical_compound_source 'Langban, Sweden'
_chemical_formula_sum 'Mn2.81 W.4 Mg.3 Si O7'
_cell_length_a 8.155
_cell_length_b 8.155
_cell_length_c 4.785
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 275.588
_exptl_crystal_density_diffrn      4.523
_symmetry_space_group_name_H-M 'P 63'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'x-y,x,1/2+z'
  '-y,x-y,z'
  '-x,-y,1/2+z'
  '-x+y,-x,z'
  'y,-x+y,1/2+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
Mn4+1   0.00000   0.00000   0.01500   0.80000   0.01127
W1   0.00000   0.00000   0.01500   0.10000   0.01127
Mn2+2   0.30430   0.89060   0.00000   0.67000   0.00963
W2   0.30430   0.89060   0.00000   0.10000   0.00963
Mg2   0.30430   0.89060   0.00000   0.10000   0.00963
Si   0.33333   0.66667   0.43700   1.00000   0.00405
O1   0.33333   0.66667   0.76700   1.00000   0.00165
O2   0.13500   0.63000   0.29700   1.00000   0.00570
O3   0.05800   0.84300  -0.23400   1.00000   0.01507