Abstract
Faceted etch pits have been observed on chemically etched single-grain icosahedral Zn-Mg-Y quasicrystal samples with C 2, C 3 and C 5 symmetry rotation axes perpendicular to their surfaces. The anisotropic etching was produced by 2.5-5%HCl solution in ethylene. The etch pits, analysed by scanning electron microscopy (SEM), follow the icosahedral symmetry of a rhombic triacontahedron. Light figures were observed on a screen placed in between a 10mW He-Ne laser and the reflecting quasicrystal surface. Both the SEM images and the light figures can be used to determine the twofold, threefold and fivefold symmetry axes of the quasilattice as well as for investigations of intrinsic and growth defects in the quasicrystals.
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