data_global
_chemical_name_mineral 'Kovdorskite'
loop_
_publ_author_name
'Ovchinnikov V E'
'Soloveva L P'
'Pudovkina Z V'
'Kapustin Yu L'
'Belov N V'
_journal_name_full 'Doklady Akademii Nauk SSSR'
_journal_volume 255 
_journal_year 1980
_journal_page_first 351
_journal_page_last 354
_publ_section_title
;
 The crystal structure of kovdorskite Mg2(PO4)(OH)*3(H2O)
;
_database_code_amcsd 0012469
_chemical_formula_sum 'Mg2 P O8 H7'
_cell_length_a 10.35
_cell_length_b 12.90
_cell_length_c 4.73
_cell_angle_alpha 90
_cell_angle_beta 102.0
_cell_angle_gamma 90
_cell_volume 617.726
_exptl_crystal_density_diffrn      2.308
_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
_atom_site_U_iso_or_equiv
Mg1   0.15410   0.48820   0.05000   0.00849
Mg2   0.99640   0.28860   0.93390   0.00798
P   0.21960   0.32140   0.59620   0.00595
O1   0.34930   0.26610   0.58640   0.00899
O2   0.13800   0.24630   0.72950   0.01077
O3   0.13880   0.35210   0.28730   0.01153
O4   0.25600   0.41920   0.79050   0.01191
O-H5   0.97970   0.43510   0.77200   0.01051
Wat6   0.16590   0.64670   0.87350   0.01444
Wat7   0.32280   0.53280   0.36040   0.01621
Wat8   0.98610   0.15320   0.16570   0.01824