data_global
_chemical_name_mineral 'Normandite'
loop_
_publ_author_name
'Perchiazzi N'
'McDonald A M'
'Gault R A'
'Johnsen O'
'Merlino S'
_journal_name_full 'The Canadian Mineralogist'
_journal_volume 38 
_journal_year 2000
_journal_page_first 641
_journal_page_last 648
_publ_section_title
;
 The crystal structure of normandite and its crystal-chemical
 relationships with lavenite
;
_database_code_amcsd 0005650
_chemical_compound_source 'Mont Saint-Hilaire, Quebec, Canada'
_chemical_formula_sum '(Ti.876 Nb.124) Mn.784 Ca.936 Na1.28 Si2 O8 F'
_cell_length_a 10.799
_cell_length_b 9.801
_cell_length_c 7.054
_cell_angle_alpha 90
_cell_angle_beta 108.075
_cell_angle_gamma 90
_cell_volume 709.758
_exptl_crystal_density_diffrn      3.431
_symmetry_space_group_name_H-M 'P 1 21/a 1'
loop_
_space_group_symop_operation_xyz
  'x,y,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
_atom_site_U_iso_or_equiv
Ti   0.28342   0.10168   0.02100   0.87600   0.00540
Nb   0.28342   0.10168   0.02100   0.12400   0.00540
Mn   0.43676   0.36666   0.85877   0.78400   0.00926
Ca   0.43676   0.36666   0.85877   0.21600   0.00926
Ca   0.30008   0.10778   0.52449   0.72000   0.00955
Na   0.30008   0.10778   0.52449   0.28000   0.00955
Na   0.42430   0.37810   0.33720   1.00000   0.00890
Si1   0.62060   0.16450   0.21060   1.00000   0.00600
Si2   0.62090   0.16600   0.67040   1.00000   0.00600
O1   0.64310   0.16010   0.45160   1.00000   0.01470
O2   0.73950   0.26470   0.20140   1.00000   0.01020
O3   0.74610   0.25550   0.80020   1.00000   0.01030
O4   0.65270   0.01070   0.15890   1.00000   0.01100
O5   0.63340   0.00850   0.74310   1.00000   0.01140
O6   0.47650   0.22060   0.09670   1.00000   0.00950
O7   0.48430   0.23660   0.64850   1.00000   0.01190
O8   0.62620   0.47470   0.95710   1.00000   0.01270
F   0.38960   0.50540   0.59920   1.00000   0.01670