data_global _chemical_name_mineral 'Brackebuschite' loop_ _publ_author_name 'Donaldson D M' 'Barnes W H' _journal_name_full 'American Mineralogist' _journal_volume 40 _journal_year 1955 _journal_page_first 597 _journal_page_last 613 _publ_section_title ; The structures of the minerals of the descloizite and adelite groups: III - brackebuschite ; _database_code_amcsd 72 _chemical_formula_sum 'Pb2 V2 Mn O8' _cell_length_a 7.681 _cell_length_b 6.155 _cell_length_c 16.524 _cell_angle_alpha 90.0 _cell_angle_beta 93.75 _cell_angle_gamma 90.0 _cell_volume 779.525 _exptl_crystal_density_diffrn 5.958 _symmetry_space_group_name_H-M 'B 1 21/m 1' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,y,1/2+z' 'x,1/2-y,z' '1/2+x,1/2-y,1/2+z' '-x,1/2+y,-z' '1/2-x,1/2+y,1/2-z' '-x,-y,-z' '1/2-x,-y,1/2-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv Pb1 0.1149 0.25 0.3745 0.02406 Pb2 0.6233 0.25 0.2989 0.02406 V1 0.6462 0.25 0.0865 0.00633 V2 0.1233 0.25 0.1644 0.00633 Mn 0.0 0.0 0.0 0.019 O1 0.114 0.023 0.104 2.0 O2 0.941 0.25 0.23 2.0 O3 0.299 0.25 0.247 2.0 O4 0.632 0.023 0.145 2.0 O5 0.455 0.25 0.017 2.0 O6 0.846 0.25 0.024 2.0