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Hexagonal (crystal system)

From Biocrawler, the free encyclopedia.

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	$\frac6m \frac2m \frac2m$	D_6h	beryl
dihexagonal pyramidal	$6 m m$	C_6v	greenockite
hexagonal bipyramidal	$\frac6m$	C_6h	apatite
hexagonal pyramidal	6	C₆
hexagonal trapezohedral	$622$	D₆
ditrigonal bipyramidal	$\overline{6}2m$	D_3h
trigonal bipyramidal	$\overline{6}$	C_3h