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 = 600 C
 pyroxene
;
_database_code_amcsd 361
_chemical_formula_sum 'Si2 Cr Na O6'
_cell_length_a 9.612
_cell_length_b 8.77
_cell_length_c 5.279
_cell_angle_alpha 90.0
_cell_angle_beta 107.25
_cell_angle_gamma 90.0
_cell_volume 424.989
_exptl_crystal_density_diffrn  3.55
_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   0.2921  0.0912  0.2324
Cr1   0.0  0.9066  0.25
Na2   0.0  0.301  0.25
O1   0.114  0.0782  0.1362
O2   0.3611  0.2573  0.3025
O3   0.3519  0.0094  0.0074
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   0.00909  0.00994  0.01339  -0.00102  0.00485  -0.00031
Cr1   0.01003  0.0083  0.0142  0.0  0.00424  0.0
Na2   0.04004  0.01664  0.02802  0.0  -0.00209  0.0
O1   0.00781  0.01504  0.0142  -0.00131  0.00598  0.00148
O2   0.01908  0.00997  0.02678  -0.00657  0.00872  -0.00211
O3   0.01315  0.01742  0.01913  -0.0011  0.00549  -0.00643