Four Icosahedra around a Tetrahedron
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An icosahedron is placed on each face of a tetrahedron. This arrangement is sometimes used to describe certain crystal structures (super tetrahedron, Pearce cluster).
Contributed by: Sándor Kabai (July 2008)
Open content licensed under CC BY-NC-SA
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"Four Icosahedra around a Tetrahedron"
http://demonstrations.wolfram.com/FourIcosahedraAroundATetrahedron/
Wolfram Demonstrations Project
Published: July 16 2008