A quasiperiodic crystal, or 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,...
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http://en.wikipedia.org/wiki/Quasicrystal
matter formed atomically in a manner somewhere between the amorphous solids of glasses (special forms of metals and other minerals, as well as common ... [1 related articles]
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http://www.britannica.com/eb/a-z/q/5
A strange type of solid whose atomic structure is very regular but never quite repeats. Quasicrystalline structures don't have a simple unit cell that can be repeated periodically in all directions to fill space, although they do have local patterns that repeat almost periodically. They also have lo...
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a form of solid matter whose atoms are arranged like those of a crystal but assume patterns that do not exactly repeat themselves.
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