data_9007164
_publ_section_title
;
 Compression mechanisms of coesite
 Sample: X4P4, P = 2.84 GPa
;
_journal_name_full               'Physics and Chemistry of Minerals'
_journal_page_first              167
_journal_page_last               176
_journal_paper_doi               10.1007/s00269-003-0303-9
_journal_volume                  30
_journal_year                    2003
_chemical_formula_sum            'O2 Si'
_chemical_name_mineral           Coesite
_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                 120.587
_cell_angle_gamma                90
_cell_length_a                   7.0500
_cell_length_b                   12.2907
_cell_length_c                   7.1386
_cell_volume                     532.488
_diffrn_ambient_pressure         2.84e+06
_exptl_crystal_density_diffrn    2.998
_[local]_cod_chemical_formula_sum_orig 'Si O2'
_cod_database_code               9007164
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
_atom_site_U_iso_or_equiv
Si1 0.13849 0.10936 0.07116 0.00494
Si2 0.50819 0.15731 0.54319 0.00507
O1 0.00000 0.00000 0.00000 0.00861
O2 0.50000 0.11170 0.75000 0.00899
O3 0.25750 0.12731 0.93220 0.00773
O4 0.31580 0.10222 0.32640 0.00925
O5 0.02360 0.21242 0.47430 0.00811
