data_global _chemical_name_mineral 'Yoderite' loop_ _publ_author_name 'Higgins J B' 'Ribbe P H' 'Nakajima Y' _journal_name_full 'American Mineralogist' _journal_volume 67 _journal_year 1982 _journal_page_first 76 _journal_page_last 84 _publ_section_title ; An ordering model for the commensurate antiphase structure of yoderite Disordered after heating to 800 C, at T = 20 C Note: the sample is from Mautia Hill, Tanzania ; _database_code_amcsd 0000856 _chemical_formula_sum 'Si2 Al2.84 Mg Fe.16 O10' _cell_length_a 8.027 _cell_length_b 5.805 _cell_length_c 7.252 _cell_angle_alpha 90 _cell_angle_beta 104.9 _cell_angle_gamma 90 _cell_volume 326.557 _exptl_crystal_density_diffrn 3.316 _symmetry_space_group_name_H-M 'P 1 21/m 1' loop_ _space_group_symop_operation_xyz 'x,y,z' 'x,1/2-y,z' '-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_occupancy _atom_site_U_iso_or_equiv Si1 0.06340 0.25000 0.79870 1.00000 0.00494 Si2 0.33930 0.75000 0.80140 1.00000 0.00709 Al1 0.29480 0.00490 0.17800 0.75000 0.00735 Mg1 0.29480 0.00490 0.17800 0.25000 0.00735 Al2 0.38890 0.25000 0.62990 0.50000 0.00747 Mg2 0.38890 0.25000 0.62990 0.50000 0.00747 Al3 0.05590 0.25000 0.35430 0.84000 0.00595 Fe 0.05590 0.25000 0.35430 0.16000 0.00595 O1 0.05620 0.98040 0.21560 1.00000 0.00760 O2 0.45320 0.97640 0.77850 1.00000 0.01444 O3 0.14890 0.25000 0.61660 1.00000 0.01013 O4 0.22070 0.25000 0.99300 1.00000 0.00937 O5 0.29950 0.25000 0.36220 1.00000 0.00988 O6 0.16450 0.75000 0.62990 1.00000 0.00912 O7 0.28420 0.75000 0.00400 1.00000 0.01178 O8 0.36230 0.75000 0.36310 1.00000 0.01317