Merohedry

From Online Dictionary of Crystallography

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(Tidied translations and added German (U. Mueller))
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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'').
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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 ==

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