data_global
_chemical_name_mineral 'Boromuscovite'
loop_
_publ_author_name
'Liang J'
'Hawthorne F C'
'Novak M'
'Cerny P'
_journal_name_full 'The Canadian Mineralogist'
_journal_volume 33 
_journal_year 1995
_journal_page_first 859
_journal_page_last 865
_publ_section_title
;
 Crystal-structure refinement of boromuscovite polytypes using a coupled
 Rietveld-static-structure energy-minimization method
 Sample: 2M1 polytype
;
_database_code_amcsd 0005445
_chemical_compound_source 'Recice, Czech Republic'
_chemical_formula_sum 'Al1.92 (Si3 B) K.41 O12'
_cell_length_a 5.090
_cell_length_b 8.822
_cell_length_c 19.819
_cell_angle_alpha 90
_cell_angle_beta 95.62
_cell_angle_gamma 90
_cell_volume 885.674
_exptl_crystal_density_diffrn      2.662
_symmetry_space_group_name_H-M 'C 1 2/c 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,z'
  'x,-y,1/2+z'
  '1/2+x,1/2-y,1/2+z'
  '-x,y,1/2-z'
  '1/2-x,1/2+y,1/2-z'
  '-x,-y,-z'
  '1/2-x,1/2-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
Al   0.25000   0.07900  -0.00020   0.96000   0.00595
SiT1   0.44200   0.25400   0.13510   0.78000   0.00152
BT1   0.44200   0.25400   0.13510   0.22000   0.00152
SiT2   0.04500   0.42600   0.36400   0.72000   0.00215
BT2   0.04500   0.42600   0.36400   0.28000   0.00215
K   0.00000   0.10300   0.25000   0.41000   0.00329
O   0.03900   0.07200   0.45410   1.00000   0.00443
O1   0.38500   0.24800   0.05690   1.00000   0.00469
O2   0.04300   0.43800   0.44660   1.00000   0.00367
O3   0.41900   0.09000   0.16550   1.00000   0.00481
O4   0.22900   0.36100   0.16360   1.00000   0.00861
O5   0.27000   0.31400   0.34660   1.00000   0.00405