Hexagonal structure

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Hexagonal structure 2.JPG Hexagonal structure 1.JPG

Hexagonal structure 3.JPG Hexagonal structure 5.JPG

Above : the symmetry group of this structure is the point group of an hexagonal closed packed (hcp) structure, very common in crystalline solids.

Below : another structure with the same symmetry group :

Hexagonal structure 1b.JPG Hexagonal structure 2b.JPG

Hexagonal structure 3b.JPG Hexagonal structure 5b.JPG

Reference : Solid state physics, Ascroft, Mermin

See also :

icosahedron - cubic symmetry - octahedron - tetrahedral symmetry