CaNp is alpha La-derived structured and crystallizes in the trigonal R-3m space group. Ca(1) is bonded to six equivalent Ca(1) and six equivalent Np(1) atoms to form CaCa6Np6 cuboctahedra that share corners with twelve equivalent Ca(1)Ca6Np6 cuboctahedra, edges with twelve equivalent Ca(1)Ca6Np6 cuboctahedra, edges with twelve equivalent Np(1)Ca6Np6 cuboctahedra, faces with six equivalent Ca(1)Ca6Np6 cuboctahedra, and faces with twelve equivalent Np(1)Ca6Np6 cuboctahedra. Np(1) is bonded to six equivalent Ca(1) and six equivalent Np(1) atoms to form NpCa6Np6 cuboctahedra that share corners with twelve equivalent Np(1)Ca6Np6 cuboctahedra, edges with twelve equivalent Ca(1)Ca6Np6 cuboctahedra, edges with twelve equivalent Np(1)Ca6Np6 cuboctahedra, faces with six equivalent Np(1)Ca6Np6 cuboctahedra, and faces with twelve equivalent Ca(1)Ca6Np6 cuboctahedra.
CaNp is alpha La-derived structured and crystallizes in the trigonal R-3m space group. Ca(1) is bonded to six equivalent Ca(1) and six equivalent Np(1) atoms to form CaCa6Np6 cuboctahedra that share corners with twelve equivalent Ca(1)Ca6Np6 cuboctahedra, edges with twelve equivalent Ca(1)Ca6Np6 cuboctahedra, edges with twelve equivalent Np(1)Ca6Np6 cuboctahedra, faces with six equivalent Ca(1)Ca6Np6 cuboctahedra, and faces with twelve equivalent Np(1)Ca6Np6 cuboctahedra. All Ca(1)-Ca(1) bond lengths are 3.39 Å. All Ca(1)-Np(1) bond lengths are 3.69 Å. Np(1) is bonded to six equivalent Ca(1) and six equivalent Np(1) atoms to form NpCa6Np6 cuboctahedra that share corners with twelve equivalent Np(1)Ca6Np6 cuboctahedra, edges with twelve equivalent Ca(1)Ca6Np6 cuboctahedra, edges with twelve equivalent Np(1)Ca6Np6 cuboctahedra, faces with six equivalent Np(1)Ca6Np6 cuboctahedra, and faces with twelve equivalent Ca(1)Ca6Np6 cuboctahedra. All Np(1)-Np(1) bond lengths are 3.39 Å.