Geometric crystal class
From Online Dictionary of Crystallography
Revision as of 05:58, 31 January 2006 by AndreAuthier
(French: Classes cristallines géomtriques; German: Geometrische Kristall Klasse; Spanish: Clases cristallinas geométricas.)
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 point groups in E2 and E3, respectively.
Section 8.2.4 of International Tables of Crystallography, Volume A