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 0000361
_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
_cell_angle_beta 107.25
_cell_angle_gamma 90
_cell_volume 424.989
_exptl_crystal_density_diffrn      3.550
_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   0.09120   0.23240
Cr1   0.00000   0.90660   0.25000
Na2   0.00000   0.30100   0.25000
O1   0.11400   0.07820   0.13620
O2   0.36110   0.25730   0.30250
O3   0.35190   0.00940   0.00740
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 0.00830 0.01420 0.00000 0.00424 0.00000
Na2 0.04004 0.01664 0.02802 0.00000 -0.00209 0.00000
O1 0.00781 0.01504 0.01420 -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 -0.00110 0.00549 -0.00643