R. W. G. Wyckoff Created 2026-10-20 Updated 2026-11-05
R. W. G. Wyckoff compiled crystallographic structures and lattice data in a major reference work. A documented magnesium entry gives the two independent lattice parameters of its hexagonal structure.
Such tables connect X-ray diffraction measurements with an atomic model: lattice dimensions specify periodic geometry, while atomic positions specify how a unit cell is occupied. Both are needed to describe a crystal structure.[ref]