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In crystallography, the tetragonal crystal system is one of the 7 lattice point groups. Tetragonal crystal lattices result from stretching a cubic lattice along one of its lattice vectors, so that the cube becomes a rectangular prism with a square base (a by a) and height (c, which is different from a).
There are two tetragonal Bravais lattices: the simple tetragonal (from stretching the simple-cubic lattice) and the centered tetragonal (from stretching either the face-centered or the body-centered cubic lattice).
 Simple tetragonal |
 Body-centered tetragonal |
The point groups that fall under this crystal system are listed below, followed by their representations in international notation and Schoenflies notation, and mineral examples.
| Name | International | Schoenflies | Example |
|---|---|---|---|
| ditetragonal bipyramidal |  |
D4h | rutile |
| ditetragonal pyramidal | 4mm | C4v | diaboleite |
| tetragonal bipyramidal |  |
C4h | scheelite |
| tetragonal pyramidal | 4 | C4 | wulfenite |
| ditetragonal alternating |  |
D2d | chalcopyrite |
| tetragonal trapezohedral | 422 | D4 | phosgenite |
| tetragonal alternating |  |
S4 | cahnite |
See also
References
- Hurlbut, Cornelius S.; Klein, Cornelis, 1985, Manual of Mineralogy, 20th ed., pp. 73 - 78, ISBN 0-471-80580-7
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- This page was last modified on 2 November 2008, at 23:01.
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