From Online Dictionary of Crystallography
Maille conventionnelle (Fr). Konventionelle Zelle (Ge). Cella convenzionale (It). 慣用単位胞 (Ja). Celda convencional (Sp).
For each lattice, the conventional cell is the cell obeying the following conditions:
- its basis vectors define a right-handed axial setting;
- its edges are along symmetry directions of the lattice;
- it is the smallest cell compatible with the above condition.
Crystals having the same type of conventional cell belong to the same crystal family.