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Article: Crystal system

Crystal system

Crystal Systems

  • The diamond crystal structure belongs to the face-centered cubic lattice.
  • Crystal systems are sets of point groups and lattice systems.
  • Crystal systems are classified into seven categories: triclinic, monoclinic, orthorhombic, tetragonal, trigonal, hexagonal, and cubic.
  • Crystals in the same crystal system have similar symmetries.
  • Crystal systems with space groups assigned to a common lattice system are combined into a crystal family.

Classification of Crystals

  • Crystals can be classified based on lattice systems, crystal systems, and crystal families.
  • Trigonal crystal system is often confused with the rhombohedral lattice system.
  • The term crystal system is sometimes used interchangeably with lattice system or crystal family.

Lattice System

  • A lattice system is a group of lattices with the same set of lattice point groups.
  • There are seven lattice systems: triclinic, monoclinic, orthorhombic, tetragonal, rhombohedral, hexagonal, and cubic.

Crystal Family

  • A crystal family is formed by combining crystal systems with space groups assigned to a common lattice system.
  • Hexagonal and trigonal crystal systems are combined into the hexagonal crystal family.


  • J. D. Bernal
  • Herman Francis Mark
  • Ralph Wyckoff
  • Martin Buerger
  • Johannes M. Bijvoet
  • Fritz Laves
  • Linus Pauling
  • Aaron Klug
  • Dorothy Hodgkin
  • Kathleen Lonsdale
  • Rosalind Franklin
  • Jack D. Dunitz
  • Alexander F. Wells
  • Crystallography Pioneers:
  • Linus Pauling
  • Dorothy Hodgkin
  • Aaron Klug
  • Kathleen Lonsdale
  • Rosalind Franklin

Crystal system Data Sources

Reference URL
Knowledge Graph

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