Be2Yb2NiSi2O10 is Esseneite-derived structured and crystallizes in the monoclinic P2_1/c space group. Be(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form BeO4 tetrahedra that share  a cornercorner with one Ni(1)O6 octahedra, corners with three equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles are 58°. Yb(1) is bonded in a 8-coordinate geometry to one O(1), one O(5), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. Ni(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(5) atoms to form NiO6 octahedra that share corners with two equivalent Be(1)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra, and edges with two equivalent Be(1)O4 tetrahedra. Si(1) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form SiO4 tetrahedra that share corners with two equivalent Ni(1)O6 octahedra and corners with three equivalent Be(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 59°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Be(1), one Yb(1), one Ni(1), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Be(1), two equivalent Yb(1), and one Si(1) atom. In the third O site, O(3) is bonded to one Be(1), two equivalent Yb(1), and one Ni(1) atom to form distorted corner-sharing OYb2BeNi tetrahedra. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Yb(1) and one Si(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Be(1), one Yb(1), one Ni(1), and one Si(1) atom.
Be2Yb2NiSi2O10 is Esseneite-derived structured and crystallizes in the monoclinic P2_1/c space group. Be(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form BeO4 tetrahedra that share  a cornercorner with one Ni(1)O6 octahedra, corners with three equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Ni(1)O6 octahedra. The corner-sharing octahedral tilt angles are 58°. The Be(1)-O(1) bond length is 1.68 Å. The Be(1)-O(2) bond length is 1.62 Å. The Be(1)-O(3) bond length is 1.59 Å. The Be(1)-O(5) bond length is 1.67 Å. Yb(1) is bonded in a 8-coordinate geometry to one O(1), one O(5), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms. The Yb(1)-O(1) bond length is 2.34 Å. The Yb(1)-O(5) bond length is 2.37 Å. Both Yb(1)-O(2) bond lengths are 2.51 Å. There is one shorter (2.47 Å) and one longer (2.50 Å) Yb(1)-O(3) bond length. Both Yb(1)-O(4) bond lengths are 2.45 Å. Ni(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(5) atoms to form NiO6 octahedra that share corners with two equivalent Be(1)O4 tetrahedra, corners with four equivalent Si(1)O4 tetrahedra, and edges with two equivalent Be(1)O4 tetrahedra. Both Ni(1)-O(1) bond lengths are 2.08 Å. Both Ni(1)-O(3) bond lengths are 1.92 Å. Both Ni(1)-O(5) bond lengths are 2.03 Å. Si(1) is bonded to one O(1), one O(2), one O(4), and one O(5) atom to form SiO4 tetrahedra that share corners with two equivalent Ni(1)O6 octahedra and corners with three equivalent Be(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 59°. The Si(1)-O(1) bond length is 1.66 Å. The Si(1)-O(2) bond length is 1.63 Å. The Si(1)-O(4) bond length is 1.65 Å. The Si(1)-O(5) bond length is 1.65 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Be(1), one Yb(1), one Ni(1), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted bent 120 degrees geometry to one Be(1), two equivalent Yb(1), and one Si(1) atom. In the third O site, O(3) is bonded to one Be(1), two equivalent Yb(1), and one Ni(1) atom to form distorted corner-sharing OYb2BeNi tetrahedra. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Yb(1) and one Si(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Be(1), one Yb(1), one Ni(1), and one Si(1) atom.