data_9003413
_publ_section_title
;Model pyroxenes II: Structural variation as a function of tetrahedral
 rotation model sodium indium px after Ohashi et al. (1990) with O3-O3-O3
 angle = 171.0 and model oxygen radius = 1.338
;
_journal_name_full               'American Mineralogist'
_journal_page_first              614
_journal_page_last               628
_journal_volume                  89
_journal_year                    2004
_chemical_formula_sum            'In Na O6 Si2'
_chemical_name_mineral           Pyroxene-ideal
_space_group_IT_number           15
_symmetry_space_group_name_Hall  '-C 2yc'
_symmetry_space_group_name_H-M   'C 1 2/c 1'
_cell_angle_alpha                90
_cell_angle_beta                 109.4
_cell_angle_gamma                90
_cell_length_a                   9.967
_cell_length_b                   9.241
_cell_length_c                   5.335
_cell_volume                     463.481
_exptl_crystal_density_diffrn    4.156
_[local]_cod_chemical_formula_sum_orig 'In Na Si2 O6'
_cod_database_code               9003413
loop_
_symmetry_equiv_pos_as_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
In 0.00000 0.91667 0.25000
Na 0.00000 0.25000 0.25000
Si 0.30810 0.08333 0.27480
O1 0.13380 0.08333 0.16650
O2 0.36620 0.25000 0.33350
O3 0.36620 0.01130 0.04960
