data_global _chemical_name_mineral 'Cervantite' loop_ _publ_author_name 'Thornton G' _journal_name_full 'Acta Crystallographica, Section B' _journal_volume 33 _journal_year 1977 _journal_page_first 1271 _journal_page_last 1273 _publ_section_title ; A neutron diffraction study of a-Sb2O4 ; _database_code_amcsd 0009585 _chemical_compound_source 'Synthetic' _chemical_formula_sum 'Sb O2' _cell_length_a 5.456 _cell_length_b 4.814 _cell_length_c 11.787 _cell_angle_alpha 90 _cell_angle_beta 90 _cell_angle_gamma 90 _cell_volume 309.588 _exptl_crystal_density_diffrn 6.597 _symmetry_space_group_name_H-M 'P n a 21' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2+x,1/2-y,z' '1/2-x,1/2+y,1/2+z' '-x,-y,1/2+z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_U_iso_or_equiv Sb1 -0.03200 0.03600 0.00900 -0.00165 Sb2 0.36600 0.01600 0.25300 -0.00165 O1 0.34000 0.17700 0.09620 0.00393 O2 0.15900 0.71000 0.19500 0.00393 O3 0.08600 0.20800 0.31200 0.00393 O4 0.33000 0.84000 0.41000 0.00393