data_global _chemical_name_mineral 'Forsterite' loop_ _publ_author_name 'Kudoh Y' 'Takeuchi Y' _journal_name_full 'Zeitschrift fur Kristallographie' _journal_volume 171 _journal_year 1985 _journal_page_first 291 _journal_page_last 302 _publ_section_title ; The crystal structure of forsterite Mg2SiO4 under high pressure up to 149 kb Sample: P = 47 kbar ; _database_code_amcsd 0010929 _chemical_formula_sum 'Mg2 Si O4' _cell_length_a 4.716 _cell_length_b 10.031 _cell_length_c 5.901 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 279.154 _exptl_crystal_density_diffrn 3.348 _symmetry_space_group_name_H-M 'P b n m' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,y,1/2-z' '-x,-y,1/2+z' '1/2+x,1/2-y,1/2+z' '1/2-x,1/2+y,1/2-z' '1/2-x,1/2+y,z' '1/2+x,1/2-y,-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 0.00000 0.00000 0.00000 0.00355 Mg2 0.99200 0.27760 0.25000 0.00101 Si 0.42630 0.09390 0.25000 0.00063 O1 0.76670 0.09100 0.25000 0.00469 O2 0.22220 0.44710 0.25000 0.00317 O3 0.27850 0.16340 0.03290 0.00279