Difference between revisions of "Ogdohedry"
From Online Dictionary of Crystallography
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== See also == | == See also == | ||
| + | *[[Merohedry]] | ||
| + | *[[Tetartohedry]] | ||
*Chapter 3.2.1 of ''International Tables for Crystallography, Volume A'', 6th edition | *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 10:34, 8 July 2017
Ogdoédrie (Fr). Ogdoedria (Sp). Ogdoedria (It). 八面像 (Ja)
Definition
The point group of a crystal is called ogdohedry if it is a subgroup of index 8 of the point group of its lattice.
In three-dimensional space there is only one ogdohedry: it corresponds to the geometric crystal class 3 of crystals belonging to the hexagonal lattice system (in the case of rhombohedral crystals, it corresponds instead to a tetartohedry).
See also
- Merohedry
- Tetartohedry
- Chapter 3.2.1 of International Tables for Crystallography, Volume A, 6th edition