Difference between revisions of "Crystal system"

From Online Dictionary of Crystallography

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<font color="blue">Système cristallin</font> (''Fr''). <font color="red">Kristallsystem</font> (''Ge''). <font color="black">Sistema cristallino </font> (''It''). <font color="brown">Сингония</font> (''Ru''). <font color="purple">晶系</font>(''Ja''). <font color="green">Sistema cristalino</font> (''Sp'').
<font color="blue">Système cristallin</font> (''Fr''). <font color="red">Kristallsystem</font> (''Ge''). <font color="black">Sistema cristallino</font> (''It''). <font color="purple">晶系</font> (''Ja''). <font color="brown">Сингония</font> (''Ru''). <font color="green">Sistema cristalino</font> (''Sp'').
== Definition ==
== Definition ==

Revision as of 13:06, 29 November 2017

Système cristallin (Fr). Kristallsystem (Ge). Sistema cristallino (It). 晶系 (Ja). Сингония (Ru). Sistema cristalino (Sp).


A crystal-class system, or crystal system for short, contains complete geometric crystal classes of space groups. All those geometric crystal classes belong to the same crystal system which intersect exactly the same set of Bravais flocks.

Crystal systems in two and three dimensions

In two-dimensional space there exist four crystal systems:

  • oblique
  • rectangular
  • square
  • hexagonal

In three-dimensional space there exist seven crystal systems:

  • triclinic
  • monoclinic
  • orthorhombic
  • tetragonal
  • trigonal
  • hexagonal
  • cubic

Note that the adjective rhombohedral refers to a lattice system, not to a crystal system. Rhombohedral crystals belong to the trigonal crystal system, but trigonal crystals may belong to the rhombohedral or to the hexagonal lattice system.

See also

  • Lattice system
  • Chapter of International Tables for Crystallography, Volume A, 6th edition