Ogdohedry

From Online Dictionary of Crystallography

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<font color="blue">Ogdoédrie </font>(''Fr''). <Font color="green"> Ogdoedria </Font>(''Sp''). <Font color="black"> Ogdoedria </Font>(''It''). <Font color="purple"> 八面像 </Font>(''Ja'')
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<font color="blue">Ogdoédrie</font> (''Fr''). <font color="red">Ogdoedrie</font> (''Ge''). <font color="black">Ogdoedria</font> (''It''). <font color="purple">八面像</font>(''Ja''). <font color="green">Ogdoedría</font> (''Sp'').

Latest revision as of 13:17, 16 November 2017

Ogdoédrie (Fr). Ogdoedrie (Ge). Ogdoedria (It). 八面像(Ja). Ogdoedría (Sp).


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