Table 4. Lattice Parameter Relationships for Materials of Different Lattice Systems.

crystal system	edge lengths	axial angles	space groups
cubic	a = b = c	α = β = γ = 90	195–230
hexagonal	a = b	α = β = 90, γ = 120	168–194
trigonal	a = b ≠ c	α = β = 90, γ = 120	143–167
tetragonal	a = b ≠ c	α = β = γ = 90	75–142
orthorhombic	a ≠ b ≠ c	α = β = γ = 90	16–74
monoclinic	a ≠ c	α = γ = 90, β ≠ 90	3–15
triclinic	all other cases	all other cases	1–2