data_global _chemical_name_mineral 'Caswellsilverite' loop_ _publ_author_name 'Engelsman F M R' 'Wiegers G A' 'Jellinek F' 'VanLaar B' _journal_name_full 'Journal of Solid State Chemistry' _journal_volume 6 _journal_year 1973 _journal_page_first 574 _journal_page_last 582 _publ_section_title ; Crystal structures and magnetic structures of some metal chromium(III) sulfides and selenides Sample: T = 300 K ; _database_code_amcsd 0013301 _chemical_compound_source 'Synthetic' _chemical_formula_sum 'Na Cr S2' _cell_length_a 3.5544 _cell_length_b 3.5544 _cell_length_c 19.4920 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 120 _cell_volume 213.265 _exptl_crystal_density_diffrn 3.250 _symmetry_space_group_name_H-M 'R -3 m' loop_ _space_group_symop_operation_xyz 'x,y,z' '2/3+x,1/3+y,1/3+z' '1/3+x,2/3+y,2/3+z' 'x,x-y,z' '2/3+x,1/3+x-y,1/3+z' '1/3+x,2/3+x-y,2/3+z' 'y,x,-z' '2/3+y,1/3+x,1/3-z' '1/3+y,2/3+x,2/3-z' '-x+y,y,z' '2/3-x+y,1/3+y,1/3+z' '1/3-x+y,2/3+y,2/3+z' '-x,-x+y,-z' '2/3-x,1/3-x+y,1/3-z' '1/3-x,2/3-x+y,2/3-z' '-y,-x,z' '2/3-y,1/3-x,1/3+z' '1/3-y,2/3-x,2/3+z' 'x-y,-y,-z' '2/3+x-y,1/3-y,1/3-z' '1/3+x-y,2/3-y,2/3-z' 'y,-x+y,-z' '2/3+y,1/3-x+y,1/3-z' '1/3+y,2/3-x+y,2/3-z' '-x+y,-x,z' '2/3-x+y,1/3-x,1/3+z' '1/3-x+y,2/3-x,2/3+z' '-x,-y,-z' '2/3-x,1/3-y,1/3-z' '1/3-x,2/3-y,2/3-z' '-y,x-y,z' '2/3-y,1/3+x-y,1/3+z' '1/3-y,2/3+x-y,2/3+z' 'x-y,x,-z' '2/3+x-y,1/3+x,1/3-z' '1/3+x-y,2/3+x,2/3-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z Na 0.00000 0.00000 0.50000 Cr 0.00000 0.00000 0.00000 S 0.00000 0.00000 0.26620