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 Ordered, T = 20 deg C Note: the sample is from Mautia Hill, Tanzania ; _database_code_amcsd 0000855 _chemical_formula_sum 'Si2 Al2.84 Mg Fe.16 O10' _cell_length_a 8.022 _cell_length_b 5.816 _cell_length_c 7.250 _cell_angle_alpha 90 _cell_angle_beta 104.9 _cell_angle_gamma 90 _cell_volume 326.882 _exptl_crystal_density_diffrn 3.312 _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 0.06370 0.25000 0.79840 1.00000 0.00583 Si2 0.33960 0.75000 0.80240 1.00000 0.00773 Al1 0.29520 0.00510 0.17760 0.75000 0.00709 Mg1 0.29520 0.00510 0.17760 0.25000 0.00709 Al2 0.38880 0.25000 0.63010 0.50000 0.00912 Mg2 0.38880 0.25000 0.63010 0.50000 0.00912 Al3 0.05570 0.25000 0.35390 0.84000 0.00950 Fe 0.05570 0.25000 0.35390 0.16000 0.00950 O1 0.05730 0.98010 0.21470 1.00000 0.00874 O2 0.45250 0.97600 0.78120 1.00000 0.01684 O3 0.14780 0.25000 0.61450 1.00000 0.01153 O4 0.22060 0.25000 0.99280 1.00000 0.00912 O5 0.29790 0.25000 0.36150 1.00000 0.01178 O6 0.16520 0.75000 0.63220 1.00000 0.01026 O7 0.28300 0.75000 0.00450 1.00000 0.01343 O8 0.35970 0.75000 0.36430 1.00000 0.01469