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quasicrystal

[kwey-zahy-kris-tl, kwey-sahy‐, kwah-see‐, ‐zee‐] /ˌkweɪ zaɪˈkrɪs tl, ˌkweɪ saɪ‐, ˌkwɑ si‐, ‐zi‐/
noun
1.
a form of solid matter whose atoms are arranged like those of a crystal but assume patterns that do not exactly repeat themselves.
Origin
1985-1990
1985-90
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Encyclopedia Article for quasi-crystal

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 glass) and the precise pattern of crystals. Like crystals, quasicrystals contain an ordered structure, but the patterns are subtle and do not recur at precisely regular intervals. Rather, quasicrystals appear to be formed from two different structures assembled in a nonrepeating array, the three-dimensional equivalent of a tile floor made from two shapes of tile and having an orientational order but no repetition.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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