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The '''tetragonal''' [[crystal system]] has three [[Axis|axes]] of [[symmetry]]: two axes, of equal length, lie in a plane at 90°; the third is longer or shorter and is at [[right angle]]s to the others.
Crystals are often long and slender or even [[needle-like]]; characteristic forms are four-sided [[prism]]s, [[pyramid]]s, and [[dipyramid]]s.
==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 often long and slender or even [[needle-like]]; characteristic forms are four-sided [[prism]]s, [[pyramid]]s, and [[dipyramid]]s.
==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]]