data_global _chemical_name_mineral 'Trechmannite' loop_ _publ_author_name 'Matsumoto T' 'Nowacki W' _journal_name_full 'Zeitschrift fur Kristallographie' _journal_volume 129 _journal_year 1969 _journal_page_first 163 _journal_page_last 177 _publ_section_title ; The crystal structure of trechmannite, AgAsS2 ; _database_code_amcsd 0010682 _chemical_compound_source 'Lengenbach quarry, Binnatal, Canton Wallis, Switzerland' _chemical_formula_sum 'Ag As S2' _cell_length_a 13.98 _cell_length_b 13.98 _cell_length_c 9.12 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 120 _cell_volume 1543.618 _exptl_crystal_density_diffrn 4.781 _symmetry_space_group_name_H-M 'R -3' 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' '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 Ag 0.33300 0.08220 0.98800 As 0.62220 0.17000 0.02270 S1 0.36080 0.11010 0.49960 S2 0.62430 0.17520 0.52190 loop_ _atom_site_aniso_label _atom_site_aniso_U_11 _atom_site_aniso_U_22 _atom_site_aniso_U_33 _atom_site_aniso_U_12 _atom_site_aniso_U_13 _atom_site_aniso_U_23 Ag 0.02874 0.02577 0.03392 0.01225 0.00263 -0.00280 As 0.02072 0.02012 0.02364 0.01002 0.00034 0.00017 S1 0.01485 0.01582 0.01997 0.00594 -0.00106 -0.00089 S2 0.01693 0.01686 0.02086 0.00839 -0.00207 0.00106