data_global _chemical_name_mineral 'Wadsleyite' loop_ _publ_author_name 'Hazen R M' 'Weinberger M B' 'Yang H' 'Prewitt C T' _journal_name_full 'American Mineralogist' _journal_volume 85 _journal_year 2000 _journal_page_first 770 _journal_page_last 777 _publ_section_title ; Comparative high-pressure crystal chemistry of wadsleyite, beta-(Mg_1-xFe_x)2SiO4, with x=0 and 0.25 Sample: P = 2.72 GPa, X = .00 ; _database_code_amcsd 0002440 _chemical_formula_sum 'Mg2 Si O4' _cell_length_a 5.6731 _cell_length_b 11.4114 _cell_length_c 8.2067 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 531.285 _exptl_crystal_density_diffrn 3.518 _symmetry_space_group_name_H-M 'I m m a' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2+y,1/2+z' 'x,1/2-y,z' '1/2+x,-y,1/2+z' '-x,1/2+y,-z' '1/2-x,+y,1/2-z' '-x,y,z' '1/2-x,1/2+y,1/2+z' 'x,-y,-z' '1/2+x,1/2-y,1/2-z' 'x,1/2+y,-z' '1/2+x,+y,1/2-z' '-x,1/2-y,z' '1/2-x,-y,1/2+z' '-x,-y,-z' '1/2-x,1/2-y,1/2-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z Mg1 0.00000 0.00000 0.00000 Mg2 0.00000 0.25000 0.97080 Mg3 0.25000 0.12740 0.25000 Si 0.00000 0.12010 0.61700 O1 0.00000 0.25000 0.21970 O2 0.00000 0.25000 0.71620 O3 0.00000 0.98900 0.25570 O4 0.25970 0.12160 0.99280