data_9000542
_chemical_name 'Slawsonite'
loop_
_publ_author_name
'Griffen D T'
'Ribbe P H'
'Gibbs G V'
_journal_name_full "American Mineralogist"
_journal_volume 62
_journal_year 1977
_journal_page_first 31
_journal_page_last 35
_publ_section_title
;
 The structure of slawsonite, a strontium analog of paracelsian
;
_chemical_formula_sum '(Sr.87 Ca.13) (Si2 Al2) O8'
_cell_length_a 8.888
_cell_length_b 9.344
_cell_length_c 8.326
_cell_angle_alpha 90
_cell_angle_beta 90.33
_cell_angle_gamma 90
_cell_volume 691.458
_symmetry_space_group_name_H-M 'P 1 21/a 1'
loop_
_symmetry_equiv_pos_as_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
Sr   0.89020   0.41220   0.25030   0.87000
Ca   0.89020   0.41220   0.25030   0.13000
Si1o   0.23210   0.92490   0.93110   0.50000
Al1o   0.23210   0.92490   0.93110   0.50000
Si1m   0.24050   0.91990   0.56050   0.50000
Al1m   0.24050   0.91990   0.56050   0.50000
Si2o   0.05950   0.20060   0.94400   0.50000
Al2o   0.05950   0.20060   0.94400   0.50000
Si2m   0.05410   0.19440   0.57060   0.50000
Al2m   0.05410   0.19440   0.57060   0.50000
O1o   0.19100   0.09340   0.01000   1.00000
O1m   0.18750   0.07400   0.49370   1.00000
O2o   0.11920   0.36580   0.94580   1.00000
O2m   0.12360   0.36990   0.55730   1.00000
O3o   0.92020   0.19190   0.06990   1.00000
O3m   0.89790   0.19230   0.43990   1.00000
O4   0.00920   0.15450   0.76620   1.00000
O5   0.31390   0.92520   0.74070   1.00000