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Difference between revisions of "Twinning by reticular merohedry"

From Online Dictionary of Crystallography

(Twinning by reticular merohedry)
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= [[Twinning]] by reticular merohedry =
 
= [[Twinning]] by reticular merohedry =
  
In the presence of a sublattice displaying symmetry other than that of the crystal lattice, a symmetry element belonging to the sublattice point group but not to the crystal point group can act as twinning operator. If lattice and sublattice have the same point group but (some of) their elements of symmetry are differently oriented ''[[twinning by polyholohedry]]'' can form.
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In the presence of a sublattice whose oriented [[point group]] D('''L'''<sub>T</sub>) differs from that of the crystal (individual) lattice D('''L'''<sub>ind</sub>), a symmetry element belonging to D('''L'''<sub>T</sub>) but not to D('''L'''<sub>ind</sub>) can act as [[twin element]].  
  
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If lattice and sublattice have the same point group but (some of) their symmetry elements are differently oriented, ''[[twinning by polyholohedry]]'' can occur.
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==Related articles==
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[[Twin lattice]]
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==See also==
 
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 10:23, 7 May 2006

Maclage par mériédrie réticulaire (Fr). Geminazione per meroedria reticolare(It)


Twinning by reticular merohedry

In the presence of a sublattice whose oriented point group D(LT) differs from that of the crystal (individual) lattice D(Lind), a symmetry element belonging to D(LT) but not to D(Lind) can act as twin element.

If lattice and sublattice have the same point group but (some of) their symmetry elements are differently oriented, twinning by polyholohedry can occur.

Related articles

Twin lattice

See also

Chapter 3.3 of International Tables of Crystallography, Volume D