Lef-Handed Pentagonal Icositetrahedron

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Crystal; If the alternate planes of the hexoctahedron extend until the intersect, a new for will result. This form, the Pentagonal Icositetrahedron, is bounded by twenty-four similar but unsymmetrical sides. Naumann’s symbol for this form is (m0n/2)r, y{lkh}; Miller’s is (m0n/2)l, y{klh}; h>k>l. This form is known as ‘left-handed’ because it contains the left, top plane of the front, upper octant.




George Huntington Williams, Ph.D. Elements of Crystallography for Students of Chemistry, Physics, and Mineralogy (New York, NY: Henry Holt and Company, 1892)


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