Single grains of ${\mathrm{Al}}_{60}$${\mathrm{Si}}_2$${\mathrm{Cu}}_{18}$${\mathrm{Co}}_{20}$ with a decaprismatic morphology were grown by the Bridgman method and studied by transmission electron microscopy and x-ray diffraction. Although the diffraction patterns of these grains superficially resemble that of a decagonal quasicrystal, a closer inspection reveals that they are composed of tenfold twins of a one-dimensional quasicrystal along with small domains of three crystalline approximant phases.

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