data_global
_chemical_name_mineral 'Enstatite'
loop_
_publ_author_name
'Hugh-Jones D A'
'Angel R J'
_journal_name_full 'American Mineralogist'
_journal_volume 79 
_journal_year 1994
_journal_page_first 405
_journal_page_last 410
_publ_section_title
;
 A compressional study of MgSiO3 orthoenstatite up to 8.5 GPa
 Sample: P = 0 GPa
;
_chemical_formula_sum 'Mg Si O3'
_cell_length_a 18.233
_cell_length_b 8.8191
_cell_length_c 5.1802
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 832.969
_exptl_crystal_density_diffrn      3.202
_symmetry_space_group_name_H-M 'P b c a'
loop_
_symmetry_equiv_pos_as_xyz
  'x,y,z'
  'x,1/2-y,1/2+z'
  '-x,1/2+y,1/2-z'
  '1/2-x,1/2+y,z'
  '1/2+x,1/2-y,-z'
  '1/2+x,y,1/2-z'
  '1/2-x,-y,1/2+z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
Mg1   0.37630   0.65410   0.86630   0.00849
Mg2   0.37690   0.48720   0.35890   0.01039
SiA   0.27150   0.34180   0.05060   0.00735
SiB   0.47360   0.33740   0.79810   0.00747
O1a   0.18350   0.34070   0.03400   0.00811
O2a   0.31140   0.50290   0.04300   0.00773
O3a   0.30250   0.22240   0.83200   0.00545
O1b   0.56220   0.34140   0.79800   0.01203
O2b   0.43240   0.48360   0.69000   0.00722
O3b   0.44830   0.19510   0.60300   0.00722