data_global
_chemical_name_mineral 'Acuminite'
loop_
_publ_author_name
'Krogh Andersen E'
'Ploug-Sorensen G'
'Leonardsen E'
_journal_name_full 'Zeitschrift fur Kristallographie'
_journal_volume 194 
_journal_year 1991
_journal_page_first 221
_journal_page_last 227
_publ_section_title
;
 The structure of acuminite, a strontium aluminium fluoride mineral
;
_database_code_amcsd 0010999
_chemical_compound_source 'Ivigtut, Greenland'
_chemical_formula_sum 'Sr Al F4 (O2 H3)'
_cell_length_a 13.223
_cell_length_b 5.175
_cell_length_c 14.251
_cell_angle_alpha 90
_cell_angle_beta 111.61
_cell_angle_gamma 90
_cell_volume 906.639
_exptl_crystal_density_diffrn      3.306
_symmetry_space_group_name_H-M 'C 1 2/c 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,z'
  'x,-y,1/2+z'
  '1/2+x,1/2-y,1/2+z'
  '-x,y,1/2-z'
  '1/2-x,1/2+y,1/2-z'
  '-x,-y,-z'
  '1/2-x,1/2-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   0.83050   0.82320   0.15860   0.01406
Al   0.40240   0.40200   0.42030   0.00785
F1   0.80420   0.03710   0.30680   0.01229
F2   0.66480   0.09770   0.09300   0.01520
F3   0.02360   0.79100   0.15770   0.01381
F4   0.81740   0.96010  -0.01540   0.01343
O-H1   0.48910   0.70630   0.45570   0.04002
Wat2   0.89860   0.32510   0.16170   0.09372