System	Axial distances	Axial angles	Examples
Cubic	a = b = c	α = β; = γ = 90°	NaCl
Tetragonal	a = b ≠ c	α = β; = γ = 90°	SnO2, TiO2
Orthorhombic	a ≠= b ≠ c	α = β = γ = 90°	KNO3
Monoclinic	a ≠= b ≠= c	α = β = 90°, γ ≠= 90°	Monoclinic sulfur
Rhombohedral (or trigonal)	a = b = c	α = β = γ ≠= 90°	As, Sb, NaNO3
Triclinic	a ≠= b ≠= c	α ≠= β ≠= γ ≠= 90°	H3BO3
Hexagonal	a = b ≠= c	α = β = 90°, γ = 120°	Graphite