data_global
_chemical_name_mineral 'Kosmochlor'
loop_
_publ_author_name
'Posner E S'
'Dera P'
'Downs R T'
'Lazarz J D'
'Irmen P'
_journal_name_full 'Physics and Chemistry of Minerals'
_journal_volume 41 
_journal_year 2014
_journal_page_first 695
_journal_page_last 707
_publ_section_title
;
 High-pressure single-crystal X-ray diffraction study of jadeite and kosmochlor
 Note: P = 31.3 GPa
;
_database_code_amcsd 0020190
_chemical_compound_source 'Synthetic'
_chemical_formula_sum 'Na Cr Si2 O6'
_cell_length_a 9.084
_cell_length_b 8.077
_cell_length_c 4.9544
_cell_angle_alpha 90
_cell_angle_beta 105.70
_cell_angle_gamma 90
_cell_volume 349.950
_exptl_crystal_density_diffrn      4.311
_symmetry_space_group_name_H-M 'C 1 2/c 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,1/2+y,z'
  'x,-y,1/2+z'
  '1/2+x,1/2-y,1/2+z'
  '-x,y,1/2-z'
  '1/2-x,1/2+y,1/2-z'
  '-x,-y,-z'
  '1/2-x,1/2-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
NaM2   0.00000   0.31280   0.25000   0.01100
CrM1   0.00000   0.08760   0.75000   0.00500
Si   0.29400   0.09730   0.24120   0.00600
O1   0.11200   0.09030   0.13800   0.00900
O2   0.35780   0.27100   0.34170   0.01000
O3   0.13680   0.46530   0.00570   0.00800