Crystal lattices are used to describe the geometrical symmetry within any crystal. The Bravais Crystal Lattice collection shows examples of each type of lattice, with rules that define the geometry.
Crystal Lattices
From Anne Marie Helmenstine, Ph.D., About.com
A hexagonal lattice has the same symmetry as a right prism with a hexagonal base. Graphite is an example of a hexagonal crystal.
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