# Twin law

(Difference between revisions)
 Revision as of 05:33, 26 April 2006 (view source)← Older edit Revision as of 09:42, 26 April 2006 (view source)Newer edit → Line 4: Line 4: = Twin law = = Twin law = - The ''twin law'' expresses the operation that generate a twin. It is indicated by the symbol of the twinning element of symmetry: $\bar 1$, [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. + The ''twin law'' expresses the operation that generate a twin. It is indicated by the symbol of the twinning element of symmetry: $\bar 1$, [uvw] and (''hkl'') for the centre of symmetry (''[[inversion twin]]'', direction of the rotation axis ''[[rotation twin]]''and [[Miller indices]] of the mirror plane ''[[reflection twin]]'', in the order. Usually, instead of the single (''hkl'') plane, the symbol {''hkl''} is used to indicate all the planes equivalent for symmetry. Chapter 3.3 of ''International Tables of Crystallography, Volume D''
Chapter 3.3 of ''International Tables of Crystallography, Volume D''
[[Category:Fundamental crystallography]] [[Category:Fundamental crystallography]]

## Revision as of 09:42, 26 April 2006

Loi de macle (Fr). 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: $\bar 1$, [uvw] and (hkl) for the centre of symmetry (inversion twin, direction of the rotation axis rotation twinand Miller indices of the mirror plane reflection twin, in the order. Usually, instead of the single (hkl) plane, the symbol {hkl} is used to indicate all the planes equivalent for symmetry.

Chapter 3.3 of International Tables of Crystallography, Volume D