data_global
_chemical_name_mineral 'Tikhonenkovite'
loop_
_publ_author_name
'Pudovkina Z V'
'Chernitsova N M'
'Pyatenko Yu A'
_journal_name_full 'Journal of Structural Chemistry'
_journal_volume 14 
_journal_year 1973
_journal_page_first 445
_journal_page_last 448
_publ_section_title
;
 Crystal structure refinement of tikhonenkovite Sr2[Al2F8(OH)2]*2H2O
;
_database_code_amcsd 0014058
_chemical_formula_sum 'Sr Al F4 (O2 H3)'
_cell_length_a 5.02
_cell_length_b 10.62
_cell_length_c 8.73
_cell_angle_alpha 90
_cell_angle_beta 102.7
_cell_angle_gamma 90
_cell_volume 454.031
_exptl_crystal_density_diffrn      3.301
_symmetry_space_group_name_H-M 'P 1 21/c 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'x,1/2-y,1/2+z'
  '-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
_atom_site_U_iso_or_equiv
Sr   0.12640   0.31730   0.55870   0.01900
Al   0.84700   0.02200   0.33900   0.01773
F1   0.52800   0.10000   0.25900   0.02660
F2   0.02400   0.17200   0.32600   0.03040
F3   0.65500  -0.12000   0.34700   0.02913
F4   0.90700  -0.01800   0.14900   0.03293
O-H   0.16300  -0.06200   0.45100   0.01393
Wat   0.57800   0.30500   0.44400   0.02406