data_global _amcsd_formula_title 'Sn6SiO8' loop_ _publ_author_name 'Locock A J' 'Ramik R A' 'Back M E' _journal_name_full 'The Canadian Mineralogist' _journal_volume 44 _journal_year 2006 _journal_page_first 1457 _journal_page_last 1467 _publ_section_title ; The structures of two novel Sn2+ oxysalts found with romarchite and hydroromarchite as corrosion products of pewter artifacts ; _database_code_amcsd 0006130 _chemical_formula_sum 'Sn6 Si O8' _cell_length_a 7.3742 _cell_length_b 7.3742 _cell_length_c 11.9598 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 120 _cell_volume 563.228 _exptl_crystal_density_diffrn 5.120 _symmetry_space_group_name_H-M 'P 63 m c' loop_ _space_group_symop_operation_xyz 'x,y,z' '-x,-x+y,1/2+z' 'x-y,x,1/2+z' '-y,-x,z' '-y,x-y,z' 'x-y,-y,1/2+z' '-x,-y,1/2+z' 'x,x-y,z' '-x+y,-x,z' 'y,x,1/2+z' 'y,-x+y,1/2+z' '-x+y,y,z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv Sn1 0.82637 0.17363 0.59214 0.03065 Sn2 0.49272 0.50728 0.85203 0.02947 Si 0.33333 0.66667 0.59630 0.01460 O1 0.45470 0.90940 0.54770 0.02750 O2 0.33333 0.66667 0.73070 0.02400 O3 0.66667 0.33333 0.61770 0.01180 O4 0.19460 0.38910 0.92080 0.01670