Actions

Difference between revisions of "Ogdohedry"

From Online Dictionary of Crystallography

m (Style edits to align with printed edition)
m (Added couple of links to "See also")
Line 9: Line 9:
  
 
== 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