data_global
_chemical_name_mineral 'Studenitsite'
loop_
_publ_author_name
'Yamnova N A'
'Egorov-Tismenko Y K'
'Pushcharovskii D Y'
'Malinko S V'
'Dorokhova G I'
_journal_name_full 'Crystallography Reports'
_journal_volume 38 
_journal_year 1993
_journal_page_first 749
_journal_page_last 752
_publ_section_title
;
 Crystal structure of a new natural Na,Ca-hydroborate NaCa2[B9O14(OH)4]*2H2O
;
_database_code_amcsd 0012343
_chemical_compound_source 'volcanic ash deposit, near Belgrade, Yugoslavia'
_chemical_formula_sum 'Na Ca2 B9 O20 H8'
_cell_length_a 11.503
_cell_length_b 10.53
_cell_length_c 12.58
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 99.48
_cell_volume 1502.963
_exptl_crystal_density_diffrn      2.336
_symmetry_space_group_name_H-M 'P 1 1 21/b'
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
Na   0.51160   0.97720   0.14000   0.02153
Ca1   0.12868   0.46906   0.12912   0.00849
Ca2   0.65432   0.63452   0.10010   0.00684
B1   0.93650   0.65850   0.08610   0.00874
B2   0.56950   0.81450   0.43130   0.00760
B3   0.88760   0.81870   0.21870   0.00849
B4   0.94750   0.17390   0.02120   0.01216
B5   0.50080   0.22830   0.23930   0.00671
B6   0.39060   0.09660   0.37960   0.00659
B7   0.90860   0.20410   0.83010   0.00912
B8   0.31120   0.10610   0.72870   0.00773
B9   0.29430   0.25690   0.29020   0.00887
O1   0.60840   0.79870   0.21410   0.00722
O2   0.40140   0.30680   0.24900   0.00988
O3   0.81050   0.86880   0.28140   0.01064
O4   0.45760   0.17560   0.46400   0.00975
O5   0.28180   0.64980   0.14700   0.01115
O6   0.64580   0.40800   0.11820   0.00912
O7   0.46950   0.60380   0.21010   0.00659
O8   0.51460   0.20900   0.12350   0.01026
O-h9   0.34990   0.96260   0.41440   0.00950
O10   0.04120   0.16190   0.34930   0.01013
O11   0.03650   0.77750   0.48020   0.01191
O12   0.19910   0.31580   0.26660   0.01165
O-h13   0.88240   0.02900   0.44300   0.01355
O14   0.00620   0.85820   0.23440   0.00950
O-h15   0.69410   0.02460   0.22580   0.01102
O16   0.85060   0.72660   0.14270   0.01115
O17   0.88400   0.13490   0.93260   0.01393
Ow18   0.28470   0.19460   0.03070   0.02406
O-h19   0.91880   0.10490   0.11420   0.02052
Ow20   0.64790   0.05630   0.97830   0.02824
H1   0.13800   0.01400   0.60300   0.05446
H2   0.76500   0.05400   0.18600   0.03926
H3   0.72100   0.07800   0.96700   0.06586
H4   0.62800   0.09000   0.63000   0.06713
H5   0.97800   0.13200   0.16700   0.08486
H6   0.21600   0.14400   0.03100   0.09246
H7   0.35900   0.93100   0.95300   0.18618
H8   0.34400   0.16800   0.06000   0.10512