data_global _chemical_name_mineral 'Forsterite' loop_ _publ_author_name 'Smyth J R' 'Hazen R M' _journal_name_full 'American Mineralogist' _journal_volume 58 _journal_year 1973 _journal_page_first 588 _journal_page_last 593 _publ_section_title ; The crystal structures of forsterite and hortonolite at several temperatures up to 900 C T = 600 C ; _database_code_amcsd 0000330 _chemical_compound_source 'Synthetic' _chemical_formula_sum 'Mg2 Si O4' _cell_length_a 4.778 _cell_length_b 10.290 _cell_length_c 6.017 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 295.830 _exptl_crystal_density_diffrn 3.159 _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 0.01482 Mg2 0.99190 0.27850 0.25000 0.01444 Si 0.42570 0.09410 0.25000 0.00773 O1 0.76370 0.09060 0.25000 0.01393 O2 0.21780 0.44970 0.25000 0.01203 O3 0.28220 0.16190 0.03520 0.01393