= R. W. G. Wyckoff
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<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>.<Crystal Structures by R. W. G. Wyckoff>[Research topic and author attribution in the primary publication]{ref}
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