data_global _chemical_name_mineral 'Covellite' loop_ _publ_author_name 'Fjellvag H' 'Gronvold F' 'Stolen S' 'Andresen A F' 'Mueller-Kaefer R' 'Simon A' _journal_name_full 'Zeitschrift fur Kristallographie' _journal_volume 184 _journal_year 1988 _journal_page_first 111 _journal_page_last 121 _publ_section_title ; Low-temperature structural distortion in CuS Sample: T = 8 K Note: Cell parameters estimated from Figure 1 ; _database_code_amcsd 0010981 _chemical_compound_source 'Synthetic' _chemical_formula_sum 'Cu S' _cell_length_a 3.763 _cell_length_b 6.568 _cell_length_c 16.225 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 401.007 _exptl_crystal_density_diffrn 4.751 _symmetry_space_group_name_H-M 'C m c m' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2+y,z' 'x,-y,1/2+z' '1/2+x,1/2-y,1/2+z' '-x,y,1/2-z' '1/2-x,1/2+y,1/2-z' '-x,y,z' '1/2-x,1/2+y,z' 'x,-y,-z' '1/2+x,1/2-y,-z' 'x,y,1/2-z' '1/2+x,1/2+y,1/2-z' '-x,-y,1/2+z' '1/2-x,1/2-y,1/2+z' '-x,-y,-z' '1/2-x,1/2-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv Cu1 0.00000 0.36230 0.75000 0.00253 Cu2 0.00000 0.33720 0.10700 0.00253 S1 0.00000 0.30680 0.25000 0.00443 S2 0.00000 0.00080 0.06270 0.00443