The structure of the pseudo-cubic Mg51Zn20 phase, which was related to icosahedral quasicrystals, was interpreted as being a modulated crystal. It basically comprised distorted close-packed layers with ordered atomic vacancies. The basic reciprocal lattice vectors pointed to the vertices of a distorted icosahedron.

The Pseudocubic Approximant Mg51Zn20 Interpreted as a Modulated Crystal. M.Uchida, Y.Matsui: Philosophical Magazine A, 2002, 82[4], 831-9