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 = 4.09 GPa
;
_chemical_formula_sum 'Mg Si O3'
_cell_length_a 18.0710
_cell_length_b 8.6929
_cell_length_c 5.1214
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 804.518
_exptl_crystal_density_diffrn      3.315
_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   0.37580   0.65570   0.85960   0.00456
Mg2   0.37740   0.48440   0.35120   0.00570
SiA   0.27080   0.34380   0.04330   0.00304
SiB   0.47270   0.33680   0.80210   0.00304
O1a   0.18280   0.33900   0.02300   0.00317
O2a   0.30970   0.50700   0.03900   0.00393
O3a   0.30340   0.22400   0.82500   0.00266
O1b   0.56210   0.34000   0.80400   0.00912
O2b   0.43230   0.48300   0.69000   0.00380
O3b   0.44720   0.19200   0.61200   0.00063