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'') | + | <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''). |
== Definition == | == Definition == | ||
| − | The [[point group]] of a crystal is called merohedry if it is a [[subgroup]] of the point group of its lattice. | + | 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 == | == See also == | ||
| + | *[[Hemihedry]] | ||
*[[Merohedral]] | *[[Merohedral]] | ||
| − | * | + | *[[Ogdohedry]] |
| + | *[[Tetartohedry]] | ||
| + | *Chapter 3.2.1 of ''International Tables for Crystallography, Volume A'', 6th edition | ||
| − | [[Category:Fundamental crystallography]] | + | [[Category:Fundamental crystallography]] |
[[Category:Morphological crystallography]] | [[Category:Morphological crystallography]] | ||
Revision as of 16:29, 15 May 2017
Mériédrie (Fr). Meriedria (Sp). Meriedria (It). 欠面像 (Ja).
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
- Hemihedry
- Merohedral
- Ogdohedry
- Tetartohedry
- Chapter 3.2.1 of International Tables for Crystallography, Volume A, 6th edition