Twin law

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= Twin law =
= Twin law =
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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.
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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 (''[[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''<br>
Chapter 3.3 of ''International Tables of Crystallography, Volume D''<br>
[[Category:Fundamental crystallography]]
[[Category:Fundamental crystallography]]

Revision as of 09:42, 26 April 2006

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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