data_global _chemical_name_mineral 'Guyanaite' loop_ _publ_author_name 'Pernet M' 'Berthet-Colominas C' 'Alario-Franco M' 'Christensen A' _journal_name_full 'Physica Status Solidi' _journal_volume A43 _journal_year 1977 _journal_page_first 81 _journal_page_last 88 _publ_section_title ; Etude par diffraction neutronique de l'oxyhydroxyde de chrome beta-CrO OH _cod_database_code 1008763 ; _database_code_amcsd 0016640 _chemical_formula_sum 'Cr O2 H' _cell_length_a 4.858 _cell_length_b 4.292 _cell_length_c 2.955 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 61.613 _exptl_crystal_density_diffrn 4.582 _symmetry_space_group_name_H-M 'P 21 n m' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,-y,1/2+z' 'x,y,-z' '1/2+x,-y,1/2-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z Cr1 0.00000 0.26200 0.00000 O1 0.34500 0.50900 0.00000 O2 0.63600 0.01500 0.00000 H1 0.47300 0.21500 0.00000