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Encyclopedia Britannica - Main :: PIG-POL |
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PLAGIHEDRALI CLASS (Plagihedral-hemihedral; Pentagonal icositetrahedral; Gyroidal 2). In this class there are the full number of axes of symmetry (three tetrad, four triad and six dyad), but no planes of symmetry and no centre of symmetry. Pentagonal icositetrahedron (fig. 40). This is the only simple
octahedron two pentagonal icositetrahedra {hkl) and (khl) are derived. These are each bounded by twenty-four irregularIcositetrahedron. Dodecahedron
pentagons, and although similar to each other they are respectively right- and left-handed, one being the mirror image of the other; such similar but nonsuperposable forms are said to be enantiomorphous (evavrios, opposite, and op$, form), and crystals showing such forms sometimes rotate the plane of polarization of plane-polarized light
cuprite
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