Editing Unit cell (section)

==Two dimensions==
[[File:Fundamental parallelogram.png|thumb|The [[parallelogram]] is the general primitive cell for the plane.]]
For any 2-dimensional lattice, the unit cells are [[parallelogram]]s, which in special cases may have orthogonal angles, equal lengths, or both.  Four of the five two-dimensional [[Bravais lattice]]s are represented using conventional primitive cells, as shown below. 

{| class=wikitable
! Conventional primitive cell
|[[File:2d mp.svg|80px]]
|[[File:2d op rectangular.svg|100px]]
|[[File:2d tp.svg|80px]]
|[[File:2d hp.svg|100px]]
|-
! Shape name
|[[Parallelogram]]
|[[Rectangle]]
|[[Square]]
|[[Rhombus]]
|-
! Bravais lattice
|Primitive Oblique
|Primitive Rectangular
|Primitive Square
|Primitive Hexagonal
|}

The centered rectangular lattice also has a primitive cell in the shape of a rhombus, but in order to allow easy discrimination on the basis of symmetry, it is represented by a conventional cell which contains two lattice points.

{| class=wikitable
! Primitive cell
|[[File:2d oc rhombic.svg|90px]]
|-
! Shape name
|[[Rhombus]]
|-
! Conventional cell
|[[File:2d oc rectangular.svg|90px]]
|-
! Bravais lattice
|Centered Rectangular
|}