data_global _chemical_name_mineral 'Iodargyrite' loop_ _publ_author_name 'Hull S' 'Keen D A' _journal_name_full 'Physical Review' _journal_volume B59 _journal_year 1999 _journal_page_first 750 _journal_page_last 761 _publ_section_title ; Pressure-induced phase transitions in AgCl, AgBr, and AgI Sample: P = 0.0 GPa, Phase II ; _database_code_amcsd 0015225 _chemical_formula_sum 'Ag I' _cell_length_a 4.599 _cell_length_b 4.599 _cell_length_c 7.524 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 120 _cell_volume 137.818 _exptl_crystal_density_diffrn 5.657 _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 Ag 0.00000 0.00000 0.00000 0.11272 I 0.00000 0.00000 0.33500 0.07346