data_global
_chemical_name_mineral 'Lorenzenite'
loop_
_publ_author_name
'Sundberg M R'
'Lehtinen M'
'Kivekas R'
_journal_name_full 'American Mineralogist'
_journal_volume 72 
_journal_year 1987
_journal_page_first 173
_journal_page_last 177
_publ_section_title
;
 Refinement of the crystal structure of ramsayite (lorenzenite)
;
_database_code_amcsd 0001064
_chemical_formula_sum 'Na2 Ti2 Si2 O9'
_cell_length_a 8.7128
_cell_length_b 5.2327
_cell_length_c 14.487
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 660.484
_exptl_crystal_density_diffrn      3.438
_symmetry_space_group_name_H-M 'P b c n'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'x,-y,1/2+z'
  '-x,y,1/2-z'
  '1/2-x,1/2+y,z'
  '1/2+x,1/2-y,-z'
  '1/2+x,1/2+y,1/2-z'
  '1/2-x,1/2-y,1/2+z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Na   0.06430   0.64500   0.15370
Ti   0.15130   0.13220   0.33090
Si   0.34210   0.29610   0.52670
O1   0.00000   0.00600   0.25000
O2   0.18170   0.44070   0.27580
O3   0.33360   0.29670   0.41520
O4   0.00890   0.24280   0.42800
O5   0.23570   0.05980   0.56700
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Na 0.01310 0.01230 0.01420 0.00380 0.00110 -0.00010
Ti 0.00320 0.00330 0.00650 0.00013 0.00023 0.00061
Si 0.00490 0.00410 0.00760 -0.00020 -0.00040 0.00010
O1 0.00840 0.00690 0.01030 0.00000 -0.00240 0.00000
O2 0.00790 0.00760 0.00970 -0.00170 -0.00230 0.00130
O3 0.00670 0.00690 0.00780 -0.00070 -0.00050 0.00090
O4 0.00580 0.00940 0.01300 -0.00060 0.00230 -0.00010
O5 0.00770 0.00540 0.00990 -0.00230 0.00100 0.00030