Glass

Livescience.com has an article about recent breakthroughs in understanding the nature and microscopic structure of glass, including it possibly being metastable rather than stable. This, as the article notes, may help in improving the production of metallic glasses. The key to the amorphous structure of glass, and lack of crystal growth, is the formation of icosahedral arrangements of glass molecules, which due to their five-fold symmetry inhibit formation of a regular structure.

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