data_global
_chemical_name_mineral 'Walstromite'
loop_
_publ_author_name
'Dent Glasser L S'
'Glasser F P'
_journal_name_full 'American Mineralogist'
_journal_volume 53
_journal_year 1968
_journal_page_first 9
_journal_page_last 13
_publ_section_title
;
 The crystal structure of walstromite
;
_database_code_amcsd 165
_chemical_formula_sum 'Ca2 Ba Si3 O9'
_cell_length_a 6.733
_cell_length_b 9.616
_cell_length_c 6.723
_cell_angle_alpha 69.62
_cell_angle_beta 102.33
_cell_angle_gamma 96.9
_cell_volume 398.121
_exptl_crystal_density_diffrn  3.718
_symmetry_space_group_name_H-M 'P -1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Ca1   0.272  0.507  0.763
Ca2   0.435  0.831  0.935
Ba   0.049  0.848  0.323
Si1   0.096  0.222  0.145
Si2   0.235  0.484  0.284
Si3   0.442  0.196  0.511
O1   0.236  0.251  -0.027
O2   -0.098  0.114  0.102
O3   0.042  0.366  0.212
O4   0.366  0.556  0.089
O5   0.125  0.58  0.389
O6   0.352  0.365  0.494
O7   0.613  0.238  0.368
O8   0.517  0.084  0.765
O9   0.238  0.13  0.389