data_global
_chemical_name_mineral 'Silvialite'
loop_
_publ_author_name
'Teertstra D K'
'Schindler M'
'Sherriff B L'
'Hawthorne F C'
_journal_name_full 'Mineralogical Magazine'
_journal_volume 63 
_journal_year 1999
_journal_page_first 321
_journal_page_last 329
_publ_section_title
;
 Silvialite, a new sulfate-dominant member of the scapolite group with
 an Al-Si composition near the I4/m-P42/n phase transition
;
_database_code_amcsd 0014537
_chemical_compound_source 'McBride Province, Australia'
_chemical_formula_sum '(Na1.548 Ca2.452) (Al4.872 Si7.128) (S.522 C.478) O27.524'
_cell_length_a 12.160
_cell_length_b 12.160
_cell_length_c 7.560
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 1117.864
_exptl_crystal_density_diffrn      2.758
_symmetry_space_group_name_H-M 'I 4/m'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,1/2+z'
  'y,-x,-z'
  '1/2+y,1/2-x,1/2-z'
  '-y,x,z'
  '1/2-y,1/2+x,1/2+z'
  'x,y,-z'
  '1/2+x,1/2+y,1/2-z'
  '-x,-y,z'
  '1/2-x,1/2-y,1/2+z'
  '-y,x,-z'
  '1/2-y,1/2+x,1/2-z'
  'y,-x,z'
  '1/2+y,1/2-x,1/2+z'
  '-x,-y,-z'
  '1/2-x,1/2-y,1/2-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
Na   0.35868   0.28328   0.00000   0.38700   0.02180
Ca   0.35868   0.28328   0.00000   0.61300   0.02180
Al1   0.16079   0.09174   0.00000   0.40600   0.00850
Si1   0.16079   0.09174   0.00000   0.59400   0.00850
Al2   0.16030   0.41297   0.20683   0.40600   0.00960
Si2   0.16030   0.41297   0.20683   0.59400   0.00960
S   0.50000   0.50000   0.00000   0.52200   0.01650
C   0.50000   0.50000   0.00000   0.47800   0.01650
O1   0.04213   0.15180   0.00000   1.00000   0.01870
O2   0.18700   0.37300   0.00000   1.00000   0.01740
O3   0.44950   0.15050   0.20680   1.00000   0.02120
O4   0.26660   0.36550   0.67240   1.00000   0.02720
O5   0.40080   0.48150   0.10700   0.26100   0.03100
O6   0.60500   0.51100   0.00000   0.35900   0.07900