File:Ho-Mg-ZnQuasicrystal.jpg
Or:
Photograph of a single-grain icosahedral Ho-Mg-Zn quasicrystal grown from the ternary melt. Shown over a mm scale, the edges are 2.2 mm long. Note the clearly defined pentagonal facets, and the dodecahedral morphology. [in: Phys. Rev. B 59, 308–321 (1999)]