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 = 24 C
 pyroxene
;
_database_code_amcsd 0000359
_chemical_formula_sum 'Si2 Cr Na O6'
_cell_length_a 9.579
_cell_length_b 8.722
_cell_length_c 5.267
_cell_angle_alpha 90
_cell_angle_beta 107.37
_cell_angle_gamma 90
_cell_volume 419.980
_exptl_crystal_density_diffrn      3.593
_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   0.29210   0.09180   0.23330
Cr1   0.00000   0.90760   0.25000
Na2   0.00000   0.30080   0.25000
O1   0.11400   0.07910   0.13740
O2   0.35990   0.25830   0.30370
O3   0.35310   0.01050   0.00660
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 0.00601 0.00505 0.00188 -0.00040 0.00047 -0.00036
Cr1 0.00707 0.00563 0.00293 0.00000 0.00100 0.00000
Na2 0.01482 0.00640 0.00440 0.00000 -0.00277 0.00000
O1 0.00661 0.00682 0.00238 -0.00053 0.00068 0.00089
O2 0.00936 0.00586 0.00483 -0.00259 0.00095 -0.00084
O3 0.00745 0.00925 0.00311 -0.00004 0.00081 -0.00258