data_9000408
_chemical_name 'Biringuccite'
loop_
_publ_author_name
'Corazza E'
'Menchetti S'
'Sabelli C'
_journal_name_full "American Mineralogist"
_journal_volume 59
_journal_year 1974
_journal_page_first 1005
_journal_page_last 1015
_publ_section_title
;
 The crystal structure of biringuccite, Na4[B10O16(OH)2].2H2O
;
_chemical_formula_sum 'Na2 B5 O10 H3'
_cell_length_a 11.1955
_cell_length_b 6.5607
_cell_length_c 20.7566
_cell_angle_alpha 90
_cell_angle_beta 93.891
_cell_angle_gamma 90
_cell_volume 1521.065
_symmetry_space_group_name_H-M 'P 1 21/c 1'
loop_
_symmetry_equiv_pos_as_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_Uiso_or_equiv
Na1   0.05820   0.50210   0.22430 ?
Na2   0.43940   0.11230   0.26500 ?
Na3   0.15310   0.55190   0.04470 ?
Na4   0.47170   0.84780   0.09480 ?
B1   0.25940   0.78710   0.16480 ?
B2   0.20290   0.14430   0.16910 ?
B3   0.04190   0.88540   0.14480 ?
B4   0.89100   0.83210   0.05270 ?
B5   0.83990   0.71290   0.16230 ?
B6   0.70340   0.00240   0.18520 ?
B7   0.76000   0.35370   0.17400 ?
B8   0.54730   0.25600   0.14540 ?
B9   0.42160   0.31730   0.04480 ?
B10   0.34670   0.43260   0.14910 ?
O1   0.35090   0.65340   0.16870 ?
O2   0.29110   0.98990   0.17480 ?
O3   0.23240   0.34250   0.16750 ?
O4   0.14440   0.73760   0.14650 ?
O5   0.08420   0.08960   0.16570 ?
O6   0.95190   0.81150   0.18390 ?
O7   0.99870   0.90500   0.07570 ?
O8   0.81680   0.72850   0.09050 ?
O-h9   0.85320   0.85720  -0.01070 ?
O10   0.84940   0.49510   0.17920 ?
O11   0.73490   0.80290   0.19110 ?
O12   0.79010   0.15470   0.19080 ?
O13   0.58530   0.05160   0.17350 ?
O14   0.64710   0.40220   0.15190 ?
O15   0.45050   0.33270   0.17950 ?
O16   0.51590   0.21760   0.07610 ?
O-h17   0.41020   0.29590  -0.02100 ?
O18   0.34350   0.42850   0.07780 ?
OW1   0.30870   0.82430   0.01500 ?
OW2  -0.04120   0.37820   0.06130 ?
H1   0.36000   0.82000  -0.01500   0.05066
H2   0.28000   0.97000   0.01000   0.05066
H3  -0.02900   0.23000   0.06700   0.05066
H4  -0.05500   0.41500   0.10300   0.05066
H5   0.91000   0.93000  -0.03500   0.05066
H6   0.34300   0.31000  -0.03700   0.05066