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# Science Fair Project Encyclopedia

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# Hexagonal (crystal system)

In crystallography, the hexagonal crystal system is one of the 7 lattice point groups. It has the same symmetry as a right prism with a hexagonal base. There is only one hexagonal Bravais lattice.

Graphite is an example of a crystal that crystallizes in the hexagonal crystal system.

The point groups (crystal classes) that fall under this crystal system are listed below, followed by their representations in international notation and Schoenflies notation, and mineral examples, if they exist.

 name international Schoenflies example dihexagonal bipyramidal $\frac6m \frac2m \frac2m$ D6h beryl dihexagonal pyramidal 6mm C6v greenockite hexagonal bipyramidal $\frac6m$ C6h apatite hexagonal pyramidal 6 C6 hexagonal trapezohedral 622 D6 ditrigonal bipyramidal $\overline{6}2m$ D3h trigonal bipyramidal $\overline{6}$ C3h

03-10-2013 05:06:04