Twin law
From Online Dictionary of Crystallography
Revision as of 14:49, 21 April 2006 by GiovanniFerraris (talk | contribs)
Revision as of 14:49, 21 April 2006 by GiovanniFerraris (talk | contribs)
Legge di geminazione (It)
Twin law
The twin law expresses the operation that generate a twin. It is indicated by the symbol of the twinning element of symmetry: [math] \bar 1[/math], [uvw] and (hkl) for the centre of symmetry, direction of the rotation axis and Miller indices of the mirror plane, in the order. Usually, instead of the single (hkl) plane, the symbol {hkl} is used to indicate all the planes equivalent for symmetry.