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 = 1.04 GPa
;
_chemical_formula_sum 'Mg Si O3'
_cell_length_a 18.186
_cell_length_b 8.782
_cell_length_c 5.1610
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 824.260
_exptl_crystal_density_diffrn      3.236
_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   0.37680   0.65450   0.86270   0.00646
Mg2   0.37700   0.48600   0.35560   0.00811
SiA   0.27160   0.34210   0.04820   0.00621
SiB   0.47370   0.33650   0.79970   0.00519
O1a   0.18230   0.33800   0.03200   0.01102
O2a   0.31110   0.50400   0.04300   0.00747
O3a   0.30300   0.22300   0.82900   0.00228
O1b   0.56270   0.34000   0.80000   0.00798
O2b   0.43150   0.48300   0.68600   0.00469
O3b   0.44720   0.19400   0.60700   0.00659