data_global _chemical_name_mineral 'Helvine' loop_ _publ_author_name 'Kudoh Y' 'Takeuchi Y' _journal_name_full 'Zeitschrift fur Kristallographie' _journal_volume 173 _journal_year 1985 _journal_page_first 305 _journal_page_last 312 _publ_section_title ; The effect of pressure on helvite Mn8S2[Be6Si6O24] Sample: P = 40 kbar ; _database_code_amcsd 0010955 _chemical_compound_source 'Schwarzenberg, Saxony' _chemical_formula_sum 'Mn4 Be3 Si3 O12 S' _cell_length_a 8.203 _cell_length_b 8.203 _cell_length_c 8.203 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 551.973 _exptl_crystal_density_diffrn 3.340 _symmetry_space_group_name_H-M 'P -4 3 n' loop_ _space_group_symop_operation_xyz 'x,y,z' '-z,x,-y' '-y,z,-x' '-x,y,-z' '1/2+x,1/2-z,1/2-y' '1/2+z,1/2-y,1/2-x' '1/2+y,1/2-x,1/2-z' '1/2+x,1/2+z,1/2+y' '1/2+z,1/2+y,1/2+x' '1/2+y,1/2+x,1/2+z' '-z,-x,y' '-y,-z,x' '-x,-y,z' 'z,-x,-y' 'y,-z,-x' 'x,-y,-z' '1/2-x,1/2+z,1/2-y' '1/2-z,1/2+y,1/2-x' '1/2-y,1/2+x,1/2-z' '1/2-x,1/2-z,1/2+y' '1/2-z,1/2-y,1/2+x' '1/2-y,1/2-x,1/2+z' 'z,x,y' 'y,z,x' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv Mn 0.17080 0.17080 0.17080 0.01102 Be 0.50000 0.00000 0.25000 0.07346 Si 0.00000 0.50000 0.25000 0.00773 O 0.13820 0.14000 0.41470 0.00735 S 0.50000 0.50000 0.50000 0.03926