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The structure of synthetic gadolinite, NiYb 2 Be 2 Si 2 O 10 , space group  P 2 1 / c  with  a  = 4.664,  b  = 7.385,  c  = 9.866 Å, and  β  = 90.02° has been refined ( R  = 0.073) by least-squares methods using 595 intensities measured with a diffractometer. The structure can be derived from that of datolite, CaBSiO 4 (OH), by replacing Ca by Yb, B by Be, OH by O, and by placing Ni in octahedral coordination at the origin. It is based on sheets of four- and eight-membered rings of alternating SiO 4  and BeO 4  tetrahedra with the sheets bonded together by Ni and Yb atoms. The sum of valence-bond numbers received by oxygen, ζ(O), can be used to order bond lengths in the Ni octahedron while Mulliken bond-overlap populations can be better used to order bond lengths in the SiO 4  and BeO 4  tetrahedra.

Refinement of NiYb 2 Be 2 Si 2 O 10 , a gadolinite-type structure