data_global
_chemical_name_mineral 'Tunellite'
loop_
_publ_author_name
'Clark J R'
_journal_name_full 'Science'
_journal_volume 141 
_journal_year 1963
_journal_page_first 1178
_journal_page_last 1179
_publ_section_title
;
 Boron-oxygen polyanion in the crystal structure of tunellite
;
_database_code_amcsd 0018902
_chemical_compound_source 'Jenifer mine, Kramer borate district, California, USA'
_chemical_formula_sum 'Sr B6 O14 H8'
_cell_length_a 14.36
_cell_length_b 8.198
_cell_length_c 9.930
_cell_angle_alpha 90
_cell_angle_beta 113.92
_cell_angle_gamma 90
_cell_volume 1068.590
_exptl_crystal_density_diffrn      2.390
_symmetry_space_group_name_H-M 'P 1 21/a 1'
loop_
_space_group_symop_operation_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
Sr   0.16200   0.05600   0.19500
B1   0.19400   0.15100   0.84900
B2   0.19400   0.15600   0.58500
B3   0.04300   0.24800   0.62500
B4   0.18700   0.45500   0.22000
B5   0.25300   0.38900   0.48600
B6   0.25100   0.38800   0.02200
O1   0.19400   0.02500   0.95200
O2   0.20300   0.03800   0.48200
O-H3   0.05000   0.68100   0.42600
Wat4   0.99800   0.16800   0.23800
O-H5   0.09000   0.53600   0.17200
O6   0.24200   0.79900   0.39900
O7   0.20800   0.34100   0.34000
O8   0.23800   0.78500   0.08100
O9   0.19400   0.35000   0.10100
O10   0.08900   0.21200   0.77300
O11   0.08700   0.21000   0.53400
Wat12   0.02100   0.84000   0.06800
Wat13   0.13900   0.58000   0.71200
O14   0.22700   0.08300   0.73400