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Difference between revisions of "Merohedry"

From Online Dictionary of Crystallography

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<font color="blue">Mériédrie </font>(''Fr''). <Font color="green"> Meriedria </Font>(''Sp''). <Font color="black"> Meriedria </Font>(''It''). <Font color="purple"> 欠面像 </Font>(''Ja'')
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<font color="blue">Mériédrie</font> (''Fr''). <font color="red">Meroedrie</font> (''Ge''). <font color="black">Meriedria</font> (''It''). <font color="purple">欠面像</font> (''Ja''). <font color="green">Meroedria</font> (''Sp'').
  
 
== Definition ==
 
== Definition ==
  
The point group of a crystal is called merohedry if it is a subgroup of the point group of its lattice.
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The [[point group]] of a crystal is called merohedry if it is a [[subgroup]] of the point group of its lattice. It is a hemihedry
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(tetartohedry, ogdohedry) if it is a subgroup of index 2 (4, 8) of the point group of its lattice.
  
 
== See also ==
 
== See also ==
 
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*[[Hemihedry]]
Section 9.1 of ''International Tables of Crystallography, Volume A''
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*[[Merohedral]]
 
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*[[Ogdohedry]]
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*[[Tetartohedry]]
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*Chapter 3.2.1 of ''International Tables for Crystallography, Volume A'', 6th edition
  
 
[[Category:Fundamental crystallography]]
 
[[Category:Fundamental crystallography]]
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[[Category:Morphological crystallography]]

Latest revision as of 09:16, 11 December 2017

Mériédrie (Fr). Meroedrie (Ge). Meriedria (It). 欠面像 (Ja). Meroedria (Sp).

Definition

The point group of a crystal is called merohedry if it is a subgroup of the point group of its lattice. It is a hemihedry (tetartohedry, ogdohedry) if it is a subgroup of index 2 (4, 8) of the point group of its lattice.

See also