BRAVAIS LATTICE

                                     BRAVAIS  LATTICE

Seven crystal system are as follows:-

Crystal System	Lengths	Angles
cubic	a=b=c$a=b=c$	α=β=γ=90∘$\alpha =\beta =\gamma ={90}^{\circ }$
trigonal	a=b=c$a=b=c$	α=β=γ<120∘$\alpha =\beta =\gamma <{120}^{\circ }$, ≠90∘$\ne {90}^{\circ }$
hexagonal	a=b≠c$a=b\ne c$	α=β=90∘$\alpha =\beta ={90}^{\circ }$, γ=120∘$\gamma ={120}^{\circ }$
tetragonal	a=b≠c$a=b\ne c$	α=β=γ=90∘$\alpha =\beta =\gamma ={90}^{\circ }$
orthorhombic	a≠b≠c$a\ne b\ne c$	α=β=γ=90∘$\alpha =\beta =\gamma ={90}^{\circ }$
monoclinic	a≠b≠c$a\ne b\ne c$	α=β=90∘≠γ$\alpha =\beta ={90}^{\circ }\ne \gamma$
triclinic	a≠b≠c$a\ne b\ne c$	α≠β≠γ