data_global _amcsd_formula_title 'Pb(Al,Si)4O8' loop_ _publ_author_name 'Downs R T' 'Hazen R M' 'Finger L W' _journal_name_full 'American Mineralogist' _journal_volume 80 _journal_year 1995 _journal_page_first 937 _journal_page_last 940 _publ_section_title ; Crystal chemistry of lead aluminosilicate hollandite: A new high-pressure synthetic phase with octahedral Si ; _database_code_amcsd 0001757 _chemical_formula_sum 'Pb2.198 (Si2.4 Al1.6) O8' _cell_length_a 9.414 _cell_length_b 9.414 _cell_length_c 2.75 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 243.714 _exptl_crystal_density_diffrn 9.457 _symmetry_space_group_name_H-M 'I 4' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2+y,1/2+z' '-y,x,z' '1/2-y,1/2+x,1/2+z' '-x,-y,z' '1/2-x,1/2-y,1/2+z' 'y,-x,z' '1/2+y,1/2-x,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 Pb1 0.04350 0.00000 0.41460 0.46600 0.01900 Pb2 0.00000 0.00000 0.71790 0.33400 0.01900 Si 0.35100 0.16380 0.00000 0.60000 0.00773 Al 0.35100 0.16380 0.00000 0.40000 0.00773 O1 0.15460 0.20160 0.00000 1.00000 0.00507 O2 0.54180 0.16410 0.00000 1.00000 0.00507