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Line 1: − The '''hexagonal''' [[crystal system]] has four [[Axis|axes]] of [[symmetry]]: three, of equal length, lie in a plane at 120°; the fourth axis is longer or shorter and is at [[right angle]]s to the others.+ − − [[Crystals]] are generally [[prismatic]] or [[columnar]], with an [[hexagon]]al cross section; characteristic forms are six-sided [[prism]]s. The similar [[trigonal system]] (or rhombohedral) is often included within the hexagonal system. − − ==Sources== − *Chesterman, Charles W. ''The Audubon Society Field Guide to North American Rocks and Minerals'', Alfred A. Knopf: New York (1987), ''pp. 33-34'' − − − [[Category:Crystallography]]
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