Helices of Tetrahedra
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Tetrahedra are arranged along helices connected at vertices. Groups of such helices are placed side by side. If a group contains two helices, then the structure can be regarded as a model of a quartz crystal structure.
Contributed by: Sándor Kabai (August 2008)
Open content licensed under CC BY-NC-SA
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"Helices of Tetrahedra"
http://demonstrations.wolfram.com/HelicesOfTetrahedra/
Wolfram Demonstrations Project
Published: August 15 2008