data_global _chemical_name_mineral 'Shandite' loop_ _publ_author_name 'Peacock M A' 'McAndrew J' _journal_name_full 'American Mineralogist' _journal_volume 35 _journal_year 1950 _journal_page_first 425 _journal_page_last 439 _publ_section_title ; On parkerite and shandite and the crystal structure of Ni3Pb2S2 ; _database_code_amcsd 51 _chemical_formula_sum 'Pb2 Ni3 S2' _cell_length_a 5.576 _cell_length_b 5.576 _cell_length_c 5.576 _cell_angle_alpha 60.0 _cell_angle_beta 60.0 _cell_angle_gamma 60.0 _cell_volume 122.59 _exptl_crystal_density_diffrn 8.867 _symmetry_space_group_name_H-M 'R -3 m ' loop_ _space_group_symop_operation_xyz 'x,y,z' '-x,-z,-y' '-z,-x,-y' 'y,x,z' 'y,z,x' '-z,-y,-x' '-x,-y,-z' 'x,z,y' 'z,x,y' '-y,-x,-z' '-y,-z,-x' 'z,y,x' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z Pb1 0.0 0.0 0.0 Pb2 0.5 0.5 0.5 Ni 0.5 0.0 0.0 S 0.285 0.285 0.285