data_global _chemical_name_mineral 'Claudetite' loop_ _publ_author_name 'Frueh A J' _journal_name_full 'American Mineralogist' _journal_volume 36 _journal_year 1951 _journal_page_first 833 _journal_page_last 850 _publ_section_title ; The crystal structure of claudetite (monoclinic As2O3) ; _database_code_amcsd 53 _chemical_formula_sum 'As2 O3' _cell_length_a 5.25 _cell_length_b 12.87 _cell_length_c 4.54 _cell_angle_alpha 90.0 _cell_angle_beta 93.82 _cell_angle_gamma 90.0 _cell_volume 306.075 _exptl_crystal_density_diffrn 4.293 _symmetry_space_group_name_H-M 'P 1 21/n 1' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2-y,1/2+z' '1/2-x,1/2+y,1/2-z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z As1 0.258 0.102 0.04 As2 0.363 0.352 0.007 O1 0.45 0.22 0.03 O2 0.62 0.41 0.18 O3 0.95 0.16 0.13