data_global
_amcsd_formula_title 'K Mg O9 P3'
loop_
_publ_author_name
'Masse R'
'Grenier J'
'Averbuch-Pouchot M'
'Tranqui D'
'Durif A'
_journal_name_full 'Bulletin de la Societe Francaise de Mineralogie et de Cristallographie'
_journal_volume 90 
_journal_year 1967
_journal_page_first 158
_journal_page_last 161
_publ_section_title
;
 Etude cristallographique de trimetaphosphates hexagonaux du type M(II)
 N H4 (P O3)3 (M(II)= Zn, Co, Ca, Cd, Mg, Mn). Etude d'un cycle P3 O9
 dans un sel de potassium isomorphe. Mg K (P O3)3
 _cod_database_code 1007257
;
_database_code_amcsd 0015938
_chemical_formula_sum 'K Mg P3 O9'
_cell_length_a 6.605
_cell_length_b 6.605
_cell_length_c 9.772
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 120
_cell_volume 369.198
_exptl_crystal_density_diffrn      2.701
_symmetry_space_group_name_H-M 'P -6 c 2'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'x,x-y,-z'
  '-x+y,-x,1/2-z'
  '-y,-x,1/2+z'
  '-y,x-y,z'
  '-x+y,y,-z'
  'x,y,1/2-z'
  'x,x-y,1/2+z'
  '-x+y,-x,z'
  '-y,-x,-z'
  '-y,x-y,1/2-z'
  '-x+y,y,1/2+z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
K1   0.66667   0.33333   0.00000
Mg1   0.33333   0.66667   0.00000
P1   0.22300  -0.05700   0.25000
O1   0.24800   0.19200   0.25000
O2   0.32300  -0.08000   0.12500