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The '''hexagonal''' (or '''trigonal''') [[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 a rounded [[triangle|triangular]] or [[hexagon]]al cross section; characteristic forms are three- or six-sided [[prism]]s, [[pyramid]]s, and [[rhombohedron]]s. The very similar ''[[trigonal system]]'' 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]]
[[Crystals]] are generally [[prismatic]] or [[columnar]], with a rounded [[triangle|triangular]] or [[hexagon]]al cross section; characteristic forms are three- or six-sided [[prism]]s, [[pyramid]]s, and [[rhombohedron]]s. The very similar ''[[trigonal system]]'' 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]]