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Crystal; This form is a combination of an icositetrahedron and a rhombic dodecahedron, where the faces of the icositetrahedron replace the trihedral angles of the dodecahedron. The parameters, m, of the icositetrahedron are less then two.


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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