Cubic crystal system
There are three main varieties of these crystals:
Each is subdivided into other variants listed below. Note that although the unit cell in these crystals is conventionally taken to be a cube, the
The primitive cubic system (cP) consists of one
The body-centered cubic system (cI) has one lattice point in the center of the unit cell in addition to the eight corner points. It has a net total of 2 lattice points per unit cell (1⁄8 × 8 + 1).
The face-centered cubic system (cF) has lattice points on the faces of the cube, that each gives exactly one half contribution, in addition to the corner lattice points, giving a total of 4 lattice points per unit cell (1⁄8 × 8 from the corners plus 1⁄2 × 6 from the faces). Each sphere in a cF lattice has
The face-centered cubic system is closely related to the