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>

b>international	Schoenflies	example
ihexagonal bipyramidal	$\frac6m \frac2m \frac2m$	D_6h	beryl
ihexagonal pyramidal	$6mm$	C_6v	greenockite
exagonal bipyramidal	$\frac6m$	C_6h	apatite
exagonal pyramidal	6	C₆
exagonal trapezohedral	$622$	D₆
itrigonal bipyramidal	$\overline{6}2m$	D_3h
rigonal bipyramidal	$\overline{6}$	C_3h

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