data_global
_chemical_name_mineral 'Poirierite'
loop_
_publ_author_name
'Tomioka N'
'Bindi L'
'Okuchi T'
'Miyahara M'
'Iitaka T'
'Li Z'
'Kawatsu T'
'Xie X'
'Purevjav N'
'Tani R'
'Kodama Y'
_journal_name_full 'Communications Earth & Environment'
_journal_volume 2 
_journal_year 2021
_journal_page_first 
_journal_page_last 16
_publ_section_title
;
 Poirierite, a dense metastable polymorph of magnesium iron silicate
 in shocked meteorites
;
_database_code_amcsd 0020922
_chemical_compound_source 'Suizhou L6 chondrite'
_chemical_formula_sum 'Mg1.962 Fe.038 Si O4'
_cell_length_a 5.802
_cell_length_b 2.905
_cell_length_c 8.411
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 141.766
_exptl_crystal_density_diffrn      3.324
_symmetry_space_group_name_H-M 'P m m a'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'x,-y,z'
  '-x,y,-z'
  '1/2-x,y,z'
  '1/2+x,-y,-z'
  '1/2+x,y,-z'
  '1/2-x,-y,z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
Mg1   0.00000   0.50000   0.50000   1.00000   0.00870
Mg2   0.25000   0.00000   0.21750   0.96200   0.00710
Fe2   0.25000   0.00000   0.21750   0.03800   0.00710
Si   0.25000   0.50000   0.86420   1.00000   0.00510
O1   0.25000   0.00000   0.46930   1.00000   0.00800
O2   0.25000   0.00000   0.96280   1.00000   0.00560
O3   0.00910   0.50000   0.75830   1.00000   0.00710