data_global _chemical_name_mineral 'Abernathyite' loop_ _publ_author_name 'Ross M' 'Evans H T' _journal_name_full 'American Mineralogist' _journal_volume 49 _journal_year 1964 _journal_page_first 1578 _journal_page_last 1602 _publ_section_title ; Studies of the torbernite minerals (I): The crystal structure of abernathyite and the structurally related compounds NH4(UO2AsO4).3H2O and K(H3O)(UO2AsO4)2.6H2O Sample : Abernathyite - NH4 ; _database_code_amcsd 131 _chemical_compound_source 'Synthetic' _chemical_formula_sum 'N H10 U As O9' _cell_length_a 7.189 _cell_length_b 7.189 _cell_length_c 18.191 _cell_angle_alpha 90.0 _cell_angle_beta 90.0 _cell_angle_gamma 90.0 _cell_volume 940.142 _exptl_crystal_density_diffrn 3.399 _symmetry_space_group_name_H-M 'P 4/n c c' loop_ _space_group_symop_operation_xyz 'x,y,z' '1/2-y,1/2-x,1/2+z' '1/2+y,1/2+x,1/2-z' '1/2+y,-x,-z' '1/2-y,x,z' 'x,1/2-y,1/2+z' '-x,1/2+y,1/2-z' '1/2+x,1/2+y,-z' '1/2-x,1/2-y,z' 'y,x,1/2+z' '-y,-x,1/2-z' '-y,1/2+x,-z' 'y,1/2-x,z' '1/2-x,y,1/2+z' '1/2+x,-y,1/2-z' '-x,-y,-z' loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z _atom_site_occupancy _atom_site_U_iso_or_equiv N 0.158 0.993 0.317 0.25 0.04179 H4 0.158 0.993 0.317 1.0 0.04179 U 0.25 0.25 0.0512 1.0 0.03217 As 0.75 0.25 0.0 1.0 0.02128 Oa 0.25 0.25 0.151 1.0 2.0 Ob 0.25 0.25 0.956 1.0 0.038 Oc 0.696 0.076 0.447 1.0 2.0 Watd 0.158 0.993 0.317 0.75 0.04179