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Icosahedron Stellations


Applying the stellation process to the icosahedron gives

 20+30+60+20+60+120+12+30+60+60

cells of 11 different shapes and sizes (including the icosahedron itself).

The icosahedron has 18 fully supported stellations, 16 of them reflexible and 2 of them chiral (Webb; where, as usual, the original icosahedron itself is included in this count).

IcosahedronStellations

After application of five restrictions known as Miller's rules to define which forms should be considered distinct, 59 stellations (including the original icosahedron itself) are possible (Coxeter et al. 1999).

Of the 59, 32 have full icosahedral symmetry and 27 are enantiomeric forms. One is a Platonic solid (the icosahedron itself), one is a Kepler-Poinsot polyhedron, four are polyhedron compounds, and one is the dual polyhedron of an Archimedean solid. Note that the first real stellation (stellation #2 in Coxeter's counting) is that obtained by cumulating the icosahedron until the faces of each triangular pyramid lie parallel to the surrounding original faces. This gives fairly small spikes, and results in a solid known as the small triambic icosahedron. Note also that the great stellated dodecahedron is not an icosahedron stellation, since the faces of its groups of five triangular pyramids do not lie in the same plane even though they appear very close to it.

The stellations illustrated above are given in the ordering of Maeder (1994); Rogers uses a different ordering. Special cases are summarized in the following table.


See also

Archimedean Solid Stellations, Dodecahedron Stellations, Icosahedron, Stellation

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References

Allanson, B. "The Fifty-Nine Icosahedra." http://members.ozemail.com.au/~llan/i59.html.Ball, W. W. R. and Coxeter, H. S. M. Mathematical Recreations and Essays, 13th ed. New York: Dover, pp. 146-147, 1987.Bulatov, V. "Stellations of Icosahedron." http://bulatov.org/polyhedra/icosahedron/.Coxeter, H. S. M.; Du Val, P.; Flather, H. T.; and Petrie, J. F. The Fifty-Nine Icosahedra. Stradbroke, England: Tarquin Publications, 1999.Hart, G. "59 Stellations of the Icosahedron." http://www.georgehart.com/virtual-polyhedra/stellations-icosahedron-index.html.Inchbald, G. "In Search of the Lost Icosahedra." Math. Gaz. 86, 208-215, 2002. Maeder, R. E. "Icosahedra." http://library.wolfram.com/infocenter/MathSource/4494/. Also http://www.inf.ethz.ch/department/TI/rm/programs.html. Maeder, R. E. "The Stellated Icosahedra." Mathematica in Education 3, 5-11, 1994. http://library.wolfram.com/infocenter/Articles/2519/. Maeder, R. E. "Stellated Icosahedra." http://www.mathconsult.ch/showroom/icosahedra/. Rogers, M. "Playing with Stellations of the Icosahedron." http://demonstrations.wolfram.com/PlayingWithStellationsOfTheIcosahedron/.Update a linkWang, P. "Polyhedra." http://www.ugcs.caltech.edu/~peterw/portfolio/polyhedra/Webb, R. "Enumeration of Stellations." http://www.software3d.com/Enumerate.php.Webb, R. "Icosahedron." http://www.software3d.com/Icosahedron.php.Wells, D. The Penguin Dictionary of Curious and Interesting Geometry. Middlesex, England: Penguin Books, pp. 77-78, 1991.Wenninger, M. J. Polyhedron Models. New York: Cambridge University Press, pp. 41-65, 1989.Wheeler, A. H. "Certain Forms of the Icosahedron and a Method for Deriving and Designating Higher Polyhedra." Proc. Internat. Math. Congress 1, 701-708, 1924.

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Icosahedron Stellations

Cite this as:

Weisstein, Eric W. "Icosahedron Stellations." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/IcosahedronStellations.html

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