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Hexagonal (or Trigonal) System (view source)
Revision as of 18:11, April 10, 2007
, 18:11, April 10, 2007started article
Four [[axes of symmetry]]: three, of equal length, lie in a plane at 120°; the fourth axis is longer or shorter and is at [[right angles]] to the others.
[[Crystals]] are generally [[prismatic]] or [[columnar]], with rounded [[triangular]] or [[hexagonal]] cross section; characteristic forms are three- or six-sided [[prisms]], [[pyramids]], and [[rhombohedrons]]. The very similar ''[[trigonal system]]'' is often included within the hexagonal system. Chesterman, pp. 33-34
=Sources=
*Chesterman, Charles W. ''The Audubon Society Field Guide to North American Rocks and Minerals'', Alfred A. Knopf: New York (1987)
[[Crystals]] are generally [[prismatic]] or [[columnar]], with rounded [[triangular]] or [[hexagonal]] cross section; characteristic forms are three- or six-sided [[prisms]], [[pyramids]], and [[rhombohedrons]]. The very similar ''[[trigonal system]]'' is often included within the hexagonal system. Chesterman, pp. 33-34
=Sources=
*Chesterman, Charles W. ''The Audubon Society Field Guide to North American Rocks and Minerals'', Alfred A. Knopf: New York (1987)