data_9004117
_chemical_name 'Enstatite'
loop_
_publ_author_name
'Hawthorne F C'
'Ito J'
_journal_name_full "The Canadian Mineralogist"
_journal_volume 15
_journal_year 1977
_journal_page_first 321
_journal_page_last 338
_publ_section_title
;
 Synthesis and crystal-structure refinement of transition-metal
 orthopyroxenes I: Orthoenstatite and (Mg, Mn, Co) orthopyroxene
;
_chemical_formula_sum 'Si Mg O3'
_cell_length_a 18.216
_cell_length_b 8.813
_cell_length_c 5.179
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 831.424
_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
SiA   0.27171   0.34150   0.05030
SiB   0.47356   0.33730   0.79820
MgM1   0.37580   0.65386   0.86600
MgM2   0.37682   0.48700   0.35870
O1A   0.18332   0.33990   0.03460
O2A   0.31100   0.50240   0.04340
O3A   0.30320   0.22260  -0.16780
O1B   0.56240   0.34020   0.79970
O2B   0.43280   0.48320   0.68900
O3B   0.44770   0.19500   0.60400