Packing of Spheres and Unit Cells
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Spheres can pack in close-packed and open (non close-packed) structures. In the cubic crystal system, there are, besides the close-packed structure (face-centered cubic) two important packings. The simple cubic structure and body-centered cubic structure.
The Face-centered cubic structure is also the close-packed cubic structure. It is, besides the hexagonal close packed structure the only close packing of spheres.