data_global _chemical_name_mineral 'Dyscrasite' loop_ _publ_author_name 'Peacock M' 'Berry L' _journal_name_full 'University of Toronto Studies, Geological Series' _journal_volume 44 _journal_year 1940 _journal_page_first 47 _journal_page_last 69 _publ_section_title ; Roentgenographic observations on ore minerals _cod_database_code 1011092 ; _database_code_amcsd 0017988 _chemical_formula_sum 'Sb Ag3' _cell_length_a 2.990 _cell_length_b 5.225 _cell_length_c 4.820 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 75.302 _exptl_crystal_density_diffrn 9.821 _symmetry_space_group_name_H-M 'P m 2 m' loop_ _space_group_symop_operation_xyz 'x,y,z' '-x,y,z' 'x,y,-z' '-x,y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z Sb1 0.00000 0.00000 0.00000 Ag1 0.50000 0.50000 0.00000 Ag2 0.00000 0.65000 0.50000 Ag3 0.50000 0.17000 0.50000