Triclinic primitive unit cell has dimensions as, a=b=c and α=β=γ=90∘
Among the seven basic or primitive crystalline systems, the triclinic system is most unsymmetrical. In other cases, edge length and axial angles are given as follows
Hexagonal : a=b=c and α=β=90∘,γ=120∘
Monoclinic : a=b=c and α=γ=90∘,β=90∘
Tetragonal : a=b=c and α=β=γ=90∘