The Tetartoid
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The tetartoid has 12 identical irregular pentagonal faces. The mineral cobaltite sometimes occurs in this form. The individual pentagons can be generated from the arbitrary multiset , where , , and are non-negative. There are a few exceptions (like ), in which case "Error" is shown at the bottom of the control area, and a tetartoid based on the pentagon with vertices is shown instead.
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Contributed by: Ed Pegg Jr (August 2015)
Open content licensed under CC BY-NC-SA
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