Applying the stellation process to the icosahedron
gives
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).
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/ . Wang, 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. Referenced on Wolfram|Alpha 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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