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 0005649
_chemical_compound_source 'Amdrup Fjord'
_chemical_formula_sum '(Ti.612 Zr.388) Mn (Ca.83 Na1.17) Si2 O8 F'
_cell_length_a 10.798
_cell_length_b 9.835
_cell_length_c 7.090
_cell_angle_alpha 90
_cell_angle_beta 108.08
_cell_angle_gamma 90
_cell_volume 715.769
_exptl_crystal_density_diffrn      3.554
_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   0.28825   0.10359   0.02313   0.61200   0.01190
Zr   0.28825   0.10359   0.02313   0.38800   0.01190
Mn   0.43743   0.36943   0.85858   1.00000   0.01390
Ca   0.30224   0.10885   0.52550   0.66000   0.01580
Na   0.30224   0.10885   0.52550   0.34000   0.01580
Na   0.42560   0.37860   0.33980   0.83000   0.02060
Ca   0.42560   0.37860   0.33980   0.17000   0.02060
Si1   0.62168   0.16485   0.21360   1.00000   0.01070
Si2   0.62051   0.16633   0.67050   1.00000   0.01060
O1   0.63970   0.16280   0.45080   1.00000   0.02460
O2   0.74110   0.26270   0.20500   1.00000   0.01560
O3   0.74800   0.25120   0.80200   1.00000   0.01660
O4   0.65370   0.01110   0.16330   1.00000   0.01770
O5   0.63000   0.00880   0.74000   1.00000   0.01860
O6   0.47840   0.22090   0.09590   1.00000   0.01450
O7   0.48520   0.23920   0.65380   1.00000   0.01720
O8   0.62350   0.47550   0.95770   1.00000   0.01790
F   0.38810   0.50500   0.59980   1.00000   0.02260