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In crystallography, the hexagonal is one of the 7 crystal systems. It contains 7 point groups . It has the same symmetry as a right prism with a hexagonal base. There is only one hexagonal Bravais lattice, which has six atoms per unit cell.
Graphite is an example of a crystal that crystallizes in the hexagonal crystal system.
Hexagonal arrangements have also been observed in systems of amphiphiles and constitutes one of the types of lipid polymorphism.
The point groups (crystal classes) that fall under this crystal system are listed below, followed by their representations in Hermann-Mauguin or international notation and Schoenflies notation, and mineral examples, if they exist.
| name | international | Schoenflies | example |
| dihexagonal bipyramidal |  |
D6h | beryl |
| dihexagonal pyramidal |  |
C6v | greenockite |
| hexagonal bipyramidal |  |
C6h | apatite |
| hexagonal pyramidal |  |
C6 | nepheline |
| hexagonal trapezohedral |  |
D6 | kalsilite and high quartz |
| ditrigonal bipyramidal |  |
D3h | benitoite |
| trigonal bipyramidal |  |
C3h | none |
See also
References
- Hurlbut, Cornelius S.; Klein, Cornelis, 1985, Manual of Mineralogy, 20th ed., pp. 78 - 89, ISBN 0-471-80580-7
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- This page was last modified on 16 November 2008, at 21:52.
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