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Types of Unit Cells or Bravais Lattices

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Fourteen types of unit cells, or Bravais lattices, are identified and grouped in seven crystal systems.

Name	Picture	Structure	Axes	Angles between Axes
Simple cubic		Cubic	a = b = c	All angles equal 90°
Face-centered cubic
Body-centered cubic
Simple tetragonal		Tetragonal	a = b ≠ c	All angles equal 90°
Body-centered tetragonal
Simple orthorhombic		Orthorhombic	a ≠ b ≠ c	All angles equal 90°
Body-centered orthorhombic
Base-centered orthorhombic
Face-centered orthorhombic
Hexagonal		Hexagonal	a = b ≠ c	Two angles equal 90° and one angle equals 120°
Rhombohedral		Rhombohedral	a = b = c	All angles are equal and none equals 90°
Simple monoclinic		Monoclinic	a ≠ b ≠ c	Two angles equal 90° and one angle ( β) is not equal to 90°
Base-centered monoclinic
Triclinic		Triclinic	a ≠ b ≠ c	All angles are different and none equals 90°