data_global _chemical_name_mineral 'Alamosite' loop_ _publ_author_name 'Boucher M L' 'Peacor D R' _journal_name_full 'Zeitschrift fur Kristallographie' _journal_volume 126 _journal_year 1968 _journal_page_first 98 _journal_page_last 111 _publ_section_title ; The crystal structure of alamosite, PbSiO3 ; _database_code_amcsd 0010657 _chemical_compound_source 'Alamos, Sonora, Mexico' _chemical_formula_sum 'Pb Si O3' _cell_length_a 11.23 _cell_length_b 7.08 _cell_length_c 12.26 _cell_angle_alpha 90 _cell_angle_beta 113.25 _cell_angle_gamma 90 _cell_volume 895.613 _exptl_crystal_density_diffrn 6.303 _symmetry_space_group_name_H-M 'P 1 2/n 1' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2-x,y,1/2-z' '1/2+x,-y,1/2+z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv Pb1 0.54470 0.06670 0.67390 0.00823 Pb2 0.40960 0.38570 0.84690 0.00671 Pb3 0.29890 0.30410 0.09990 0.00722 Si1 0.61800 0.12540 0.15390 0.00443 Si2 0.52920 0.40700 0.39140 0.00557 Si3 0.71220 0.18240 0.96160 0.00253 O1 0.50000 0.50000 0.50000 0.00975 O2 0.75000 0.22490 0.25000 0.00937 O3 0.64180 0.24580 0.45760 0.01887 O4 0.65810 0.05970 0.04190 0.00722 O5 0.50700 0.28750 0.10710 0.00431 O6 0.57580 0.94420 0.21320 0.01393 O7 0.40410 0.29350 0.30360 0.00925 O8 0.42090 0.42650 0.67100 0.00975 O9 0.62690 0.37280 0.91590 0.01545 O10 0.71390 0.04970 0.85380 0.00317