UMnFe crystallizes in the orthorhombic Imma space group. U(1) is bonded in a 16-coordinate geometry to four equivalent U(1), six equivalent Mn(1), and six equivalent Fe(1) atoms. Mn(1) is bonded to six equivalent U(1), two equivalent Mn(1), and four equivalent Fe(1) atoms to form distorted MnU6Mn2Fe4 cuboctahedra that share corners with eight equivalent Fe(1)U6Mn4Fe2 cuboctahedra, corners with ten equivalent Mn(1)U6Mn2Fe4 cuboctahedra, edges with six equivalent Mn(1)U6Mn2Fe4 cuboctahedra, faces with six equivalent Mn(1)U6Mn2Fe4 cuboctahedra, and faces with twelve equivalent Fe(1)U6Mn4Fe2 cuboctahedra. Fe(1) is bonded to six equivalent U(1), four equivalent Mn(1), and two equivalent Fe(1) atoms to form FeU6Mn4Fe2 cuboctahedra that share corners with eight equivalent Mn(1)U6Mn2Fe4 cuboctahedra, corners with ten equivalent Fe(1)U6Mn4Fe2 cuboctahedra, edges with six equivalent Fe(1)U6Mn4Fe2 cuboctahedra, faces with six equivalent Fe(1)U6Mn4Fe2 cuboctahedra, and faces with twelve equivalent Mn(1)U6Mn2Fe4 cuboctahedra.
UMnFe crystallizes in the orthorhombic Imma space group. U(1) is bonded in a 16-coordinate geometry to four equivalent U(1), six equivalent Mn(1), and six equivalent Fe(1) atoms. There are two shorter (3.08 Å) and two longer (3.17 Å) U(1)-U(1) bond lengths. There are four shorter (2.96 Å) and two longer (3.01 Å) U(1)-Mn(1) bond lengths. There are four shorter (3.00 Å) and two longer (3.02 Å) U(1)-Fe(1) bond lengths. Mn(1) is bonded to six equivalent U(1), two equivalent Mn(1), and four equivalent Fe(1) atoms to form distorted MnU6Mn2Fe4 cuboctahedra that share corners with eight equivalent Fe(1)U6Mn4Fe2 cuboctahedra, corners with ten equivalent Mn(1)U6Mn2Fe4 cuboctahedra, edges with six equivalent Mn(1)U6Mn2Fe4 cuboctahedra, faces with six equivalent Mn(1)U6Mn2Fe4 cuboctahedra, and faces with twelve equivalent Fe(1)U6Mn4Fe2 cuboctahedra. Both Mn(1)-Mn(1) bond lengths are 2.58 Å. All Mn(1)-Fe(1) bond lengths are 2.56 Å. Fe(1) is bonded to six equivalent U(1), four equivalent Mn(1), and two equivalent Fe(1) atoms to form FeU6Mn4Fe2 cuboctahedra that share corners with eight equivalent Mn(1)U6Mn2Fe4 cuboctahedra, corners with ten equivalent Fe(1)U6Mn4Fe2 cuboctahedra, edges with six equivalent Fe(1)U6Mn4Fe2 cuboctahedra, faces with six equivalent Fe(1)U6Mn4Fe2 cuboctahedra, and faces with twelve equivalent Mn(1)U6Mn2Fe4 cuboctahedra. Both Fe(1)-Fe(1) bond lengths are 2.50 Å.