Natural Quasicrystals

@article{Bindi2009NaturalQ,
  title={Natural Quasicrystals},
  author={Luca Bindi and Paul J. Steinhardt and Nan Yao and Peter J. Lu},
  journal={Science},
  year={2009},
  volume={324},
  pages={1306 - 1309}
}
Forbidden Crystals In crystalline materials, a unit cell is replicated in space through a series of rotations, inversions, and reflections. In order to fully fill space, only certain rotational symmetries are allowed. Quasicrystals contain aperiodic tilings of two or more basic shapes that allow these forbidden rotation symmetries. A number of quasicrystalline materials have been synthesized in the lab, including a number of aluminum alloys. Bindi et al. (p. 1306) examined samples of the… 
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The shock-induced synthesis demonstrated in this experiment reinforces the evidence that natural quasicrystals formed during a shock event but leaves open the question of whether this synthesis pathway is attributable to the expanded thermodynamic stability range of the quAsicrystalline phase at high pressure, to a favorable kinetic pathway that exists under shock conditions, or to both thermodynamic and kinetic factors.
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