Geometric crystal class

From Online Dictionary of Crystallography

Revision as of 07:14, 27 April 2016 by MassimoNespolo (talk | contribs) (Moving the note on Japanese nomenclature to the disambiguation page)

Classe cristalline géométrique (Fr); Geometrische Kristallklasse (Ge); Clase cristallina geométrica (Sp); Classe cristallina geometrica (It); 幾何的結晶類 (Ja).


Geometric crystal classes (or simply 'crystal classes') classify the symmetry groups of the external shape of macroscopic crystals, namely according to the morphological symmetry. There are 10 two-dimensional geometric crystal classes and 32 three-dimensional geometric crystal classes, in one to one correspondence with the 10 and 32 types of point groups in E2 and E3, respectively.

See also