data_global _amcsd_formula_title 'Mg3Ga2GeO8' loop_ _publ_author_name 'Millard R L' 'Peterson R C' 'Swainson I P' _journal_name_full 'Physics and Chemistry of Minerals' _journal_volume 27 _journal_year 2000 _journal_page_first 179 _journal_page_last 193 _publ_section_title ; Synthetic MgGa2O4-Mg2GeO4 spinel solid solution and beta-Mg3Ga2GeO8: chemistry, crystal structures, cation ordering, and comparison to Mg2GeO4 olivine Sample: RLM812, beta-Mg3Ga2GeO8 spinelloid, quenched from T = 1350 C ; _database_code_amcsd 0008403 _chemical_compound_source 'Synthetic' _chemical_formula_sum 'Mg1.5 Ga Ge.5 O4' _cell_length_a 5.8236 _cell_length_b 11.8162 _cell_length_c 8.3304 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 573.238 _exptl_crystal_density_diffrn 4.785 _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 _atom_site_occupancy _atom_site_U_iso_or_equiv MgM1 0.00000 0.00000 0.00000 0.50000 0.00355 GaM1 0.00000 0.00000 0.00000 0.50000 0.00355 MgM2 0.00000 0.25000 0.97600 0.96000 0.00355 GaM2 0.00000 0.25000 0.97600 0.04000 0.00355 MgM3 0.25000 0.12910 0.25000 0.77000 0.00355 GaM3 0.25000 0.12910 0.25000 0.23000 0.00355 GaT 0.00000 0.11620 0.61860 0.50000 0.00380 GeT 0.00000 0.11620 0.61860 0.50000 0.00380 O1 0.00000 0.25000 0.22650 1.00000 0.00583 O2 0.00000 0.25000 0.73490 1.00000 0.00583 O3 0.00000 0.00590 0.24910 1.00000 0.00583 O4 0.24230 0.12270 0.00270 1.00000 0.00583