data_global
_chemical_name_mineral 'Svenekite'
loop_
_publ_author_name
'Chiari G'
'Ferraris G'
_journal_name_full 'Atti della Accademia delle Scienze di Torino, Classe di Scienze Fisiche, Matematiche e Naturali'
_journal_volume 105 
_journal_year 1971
_journal_page_first 725
_journal_page_last 743
_publ_section_title
;
 The crystal structure of calcium dihydrogen arsenate, Ca(H2AsO4)2
;
_database_code_amcsd 0018339
_chemical_compound_source 'Synthetic'
_chemical_formula_sum 'Ca As2 O8 H4'
_cell_length_a 8.558
_cell_length_b 7.697
_cell_length_c 5.721
_cell_angle_alpha 92.583
_cell_angle_beta 109.867
_cell_angle_gamma 109.983
_cell_volume 327.494
_exptl_crystal_density_diffrn      3.265
_symmetry_space_group_name_H-M 'P -1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Ca1   0.08155   0.18633   0.31161
As1   0.34162   0.23977  -0.01531
As2   0.18696   0.76630   0.33088
O1   0.17430   0.06120   0.00290
O-H2   0.37810   0.40130   0.23550
O-H3   0.53190   0.20800   0.07590
O4   0.30970   0.32410  -0.28160
O-H5   0.04730   0.67160   0.03310
O6   0.12520   0.90620   0.47670
O-H7   0.17130   0.56710   0.46790
O8   0.39650   0.86070   0.33660
loop_
_atom_site_aniso_label
_atom_site_aniso_U_11
_atom_site_aniso_U_22
_atom_site_aniso_U_33
_atom_site_aniso_U_12
_atom_site_aniso_U_13
_atom_site_aniso_U_23
Ca1 0.01519 0.01532 0.01051 0.00266 0.00277 0.00215
As1 0.01317 0.01379 0.01253 0.00201 0.00341 0.00227
As2 0.01342 0.01353 0.01341 0.00252 0.00329 0.00164
O1 0.01317 0.01671 0.01392 0.00177 0.00265 0.00265
O-H2 0.02721 0.02506 0.01823 0.00531 0.00734 0.00164
O-H3 0.01595 0.02850 0.00886 0.00456 0.00050 -0.00063
O4 0.01887 0.02101 0.01266 0.00378 0.00239 0.00429
O-H5 0.02126 0.01076 0.01228 0.00201 -0.00012 0.00189
O6 0.02533 0.01925 0.01494 0.00695 0.00644 0.00215
O-H7 0.02241 0.01950 0.01924 0.00378 0.00353 0.00570
O8 0.01379 0.02101 0.01988 0.00011 0.00329 -0.00063