data_global
_chemical_name_mineral 'Kosmochlor'
loop_
_publ_author_name
'Cameron M'
'Sueno S'
'Prewitt C T'
'Papike J J'
_journal_name_full 'American Mineralogist'
_journal_volume 58
_journal_year 1973
_journal_page_first 594
_journal_page_last 618
_publ_section_title
;
 High-temperature crystal chemistry of acmite, diopside, hedenbergite, jadeite,
 spodumene, and ureyite
 T = 400 C
 pyroxene
;
_database_code_amcsd 360
_chemical_formula_sum 'Si2 Cr Na O6'
_cell_length_a 9.597
_cell_length_b 8.751
_cell_length_c 5.274
_cell_angle_alpha 90.0
_cell_angle_beta 107.29
_cell_angle_gamma 90.0
_cell_volume 422.913
_exptl_crystal_density_diffrn  3.568
_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
Si   0.292  0.0918  0.2328
Cr1   0.0  0.9072  0.25
Na2   0.0  0.3001  0.25
O1   0.1139  0.0794  0.1369
O2   0.3607  0.2571  0.3012
O3   0.3521  0.0099  0.0062
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
Si   0.00757  0.00698  0.01569  -0.00081  0.00477  -0.00033
Cr1   0.00825  0.00757  0.01575  0.0  0.00458  0.0
Na2   0.03058  0.013  0.02337  0.0  -0.00082  0.0
O1   0.00949  0.01207  0.01936  -0.00134  0.0065  0.00022
O2   0.01497  0.0083  0.02679  -0.00544  0.00626  -0.00491
O3   0.01378  0.01463  0.02027  0.0015  0.00655  -0.00188