Jisho

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Noun, Noun which may take the genitive case particle 'no'
1. quasicrystal; paracrystal
Wikipedia definition
2. QuasicrystalA quasiperiodic crystal, or, in short, quasicrystal, is a structure that is ordered but not periodic. A quasicrystalline pattern can continuously fill all available space, but it lacks translational symmetry. While crystals, according to the classical crystallographic restriction theorem, can possess only two, three, four, and six-fold rotational symmetries, the Bragg diffraction pattern of quasicrystals shows sharp peaks with other symmetry orders, for instance five-fold.
Read “Quasicrystal” on English Wikipedia
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