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: 1M polytype
;
_database_code_amcsd 0005446
_chemical_compound_source 'Recice, Czech Republic'
_chemical_formula_sum 'Al.82 (Si3 B) K.2 (O12 H2)'
_cell_length_a 5.102
_cell_length_b 8.788
_cell_length_c 10.076
_cell_angle_alpha 90
_cell_angle_beta 101.23
_cell_angle_gamma 90
_cell_volume 443.121
_exptl_crystal_density_diffrn      2.391
_symmetry_space_group_name_H-M 'C 1 2/m 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,z'
  'x,-y,z'
  '1/2+x,1/2-y,z'
  '-x,y,-z'
  '1/2-x,1/2+y,-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   0.00000   0.66600   0.00000   0.41000   0.00785
SiT   0.43700   0.67400   0.27200   0.75000   0.00152
BT   0.43700   0.67400   0.27200   0.25000   0.00152
K   0.50000   0.00000   0.50000   0.20000   0.00329
O-H   0.43300   0.00000   0.10000   1.00000   0.00443
O1   0.34700   0.71500   0.11600   1.00000   0.00469
O2   0.19200   0.72600   0.33000   1.00000   0.00861
O3   0.52000   0.50000   0.28700   1.00000   0.00481