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Crystallography - LoveToKnow 1911 (14968 words) |
 | pentagons, and although similar to each other they are respectively rightand left-handed, one being the mirror image of the other; such similar but nonsuperposable forms are said to be enantiomorphous (iv avrios, opposite, and,uopon, form), and crystals showing such forms sometimes rotate the plane of polarization of plane-polarized light. |
| Faces of a pentagonal icositetrahedron with high indices have been very rarely observed on crystals of cuprite, potassium chloride and ammonium chloride, but none of these are circular polarizing. |
| This is bounded by twelve irregular pentagons, and is a tetartohedral or quarter-faced form of the hexakis-octahedron. |
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